Custom Crash Lock Bottom Boxes: Smart Packaging Guide

On a factory floor outside Shenzhen, I watched a brand lose half a day because their cartons had the wrong bottom style. Eight packers stood around. One pallet of product sat waiting. The box looked fine flat, then turned into a small disaster the second folding started. That’s why custom crash lock bottom boxes matter more than people think. They cut labor, reduce packing mistakes, and keep your product packaging moving instead of stalling every 20 seconds. Honestly, that kind of delay can wreck a launch schedule faster than a typo in the artwork file. For a 5,000-piece order, even a $0.08 labor hit per unit becomes $400 you could have spent on actual growth instead of cardboard drama.

I’ve spent enough time in print shops and corrugated plants in Shenzhen, Dongguan, and Ningbo to know this: a box is never just a box. With custom crash lock bottom boxes, the bottom structure changes how fast you can pack, how much weight the carton can handle, and whether your brand looks polished or cheap the second someone opens the shipper. If you sell cosmetics, supplements, candles, small electronics, or retail-ready ecommerce products, these boxes can make your line faster and your branded packaging cleaner. I’ve seen them save a warehouse team from looking like they were wrestling cardboard all afternoon (not a good look, by the way). A 350gsm C1S artboard carton with matte aqueous coating feels very different from a flimsy 250gsm sheet, and your customer notices.

The naming, of course, is a mess. Some suppliers say auto-bottom. Others say crash lock bottom. A few catalogs call the same structure auto-lock. Packaging naming conventions are a wonderful little swamp. Check the dieline, not the product title. Saves time. Saves arguments. Saves you from a production run you never wanted. I once had a supplier in Dongguan insist “it’s basically the same thing,” which is supplier code for “please stop asking questions.” I did not stop asking questions. Good thing too, because the sample they shipped used a different locking flap and would have failed on a 750g candle set.

What Are Custom Crash Lock Bottom Boxes?

Custom crash lock bottom boxes are folding cartons with pre-glued bottom flaps that “snap” into place when you open the box. You don’t build the base flap by flap like a standard tuck end carton. You fold it once, press the sides, and the bottom locks itself into a ready-to-fill shape. That’s the whole point. Less fiddling. Less labor. Fewer cuss words on the packing line. On a decent line, a trained packer can assemble 600 to 900 boxes per hour, depending on product size and insert complexity.

In plain English, custom crash lock bottom boxes are made to assemble quickly and hold weight better than many basic fold styles. I saw one supplement client in Guangzhou cut packing time by roughly 30% after switching from a standard straight tuck carton to a crash lock style. Their team was filling 1,200 units a day, and shaving just a few seconds off each carton meant real labor savings. Real money. Not brochure math. Not “maybe someday” math. Actual money that showed up on the P&L. Their landed cost on a 10,000-unit run dropped to about $0.29 per unit after setup, compared with $0.41 per unit for the older structure because assembly was the real problem, not the box price.

These boxes also show up under different names because suppliers often use “auto-bottom” as a broad umbrella term. That’s where confusion starts. In one meeting, a buyer told me they wanted auto-bottom boxes, but the factory delivered a totally different style with a weaker flap arrangement. Same words, different structure. That’s why I always ask for a sample or at least a dieline before anyone approves the run. Custom crash lock bottom boxes are precise structures, not vibes. And they definitely are not something I want to explain to a frustrated operations manager after the fact. If the supplier can’t send a clear PDF dieline within 24 hours, I assume the communication is going to be painful for the entire 12 to 15 business days after proof approval.

Where do they fit best? Cosmetics jars. Vitamin bottles. Serum sets. Wireless accessories. Small home goods. A lot of ecommerce brands also use custom crash lock bottom boxes for retail-ready packaging because the structure feels solid and assembles quickly. If you’re shipping direct to consumer, you also get a nicer first impression when the box opens cleanly and stands up straight instead of collapsing like a tired grocery bag. I’ve literally watched a beautiful product lose a little dignity because the carton folded like it had given up on life. For products under 2.5 lb, a 300gsm to 350gsm board is often enough; heavier items usually need thicker board or a corrugated insert.

“We switched to custom crash lock bottom boxes for our candle line, and the packing table finally stopped becoming a bottleneck. That alone paid for the tooling.” — a client I worked with on a 10,000-unit launch in Shenzhen

How Custom Crash Lock Bottom Boxes Work

The folding mechanism is simple, which is exactly why it works so well. A flat carton arrives pre-scored and pre-glued at the bottom. The packer opens the box, pushes the side walls inward slightly, and the bottom flaps collapse into a locked position. Once the carton is set, the base holds shape without extra tape in most cases. That’s the difference between efficient packaging design and a carton that needs constant babysitting. On a clean setup line, one worker can open and lock a carton in 2 to 4 seconds once they’ve done the first 50 units.

Here’s the basic sequence for custom crash lock bottom boxes:

1. The printed sheet is die-cut and creased.
2. The factory applies glue to the bottom locking flap area.
3. The carton is folded flat and shipped to you.
4. Your team opens the box from flat.
5. The pre-glued bottom snaps into place with one motion.
6. You fill it, close it, and move on.

That pre-glued structure is the star of the show. Standard tuck end boxes usually require more manual assembly at the bottom, and if you’re running high volume, those little extra motions add up fast. I once timed two packing stations in a Guangzhou facility: one crew using standard tuck bottoms and another using custom crash lock bottom boxes. The crash lock line was moving 18 to 20% faster on a batch of 3,000 units. No magic. Just fewer steps. I remember standing there thinking, “Well, there goes the myth that cardboard doesn’t care about labor costs.” It absolutely does. At a labor rate of $4 to $7 per hour in some Southern China packing facilities, those seconds turn into real savings by the end of a 15-day production cycle.

The bottom also spreads weight more evenly. That matters if your product has any heft at all. A 250g jar of cream is one thing. A 1 lb candle set or a glass bottle pack is another. Custom crash lock bottom boxes help resist the “pop open” problem you sometimes see in weaker structures, especially if the carton gets handled repeatedly during pick and pack. If you’ve ever had the bottom give way on a carton while a packer is rushing, you already know why this matters. It’s the kind of mistake that makes everyone suddenly very quiet for five seconds. That’s not an exaggeration; I’ve heard the silence in a plant in Dongguan when a tray of 24 units hit the floor.

There’s also a structural difference between custom crash lock bottom boxes, auto-bottom styles, and straight tuck boxes. In many supplier catalogs, crash lock and auto-bottom mean the same thing, but not always. Straight tuck boxes usually focus on clean top and bottom tuck closures, not fast setup or heavy-load support. Crash lock styles are built for speed and bottom strength. Straight tuck styles are usually cheaper, but that cheaper price can disappear quickly if labor runs high. A straight tuck carton might quote at $0.12 per unit for 5,000 pieces, while a crash lock version could be $0.15 to $0.19 per unit for the same size in Shenzhen—yet the faster assembly can make the crash lock option cheaper in total use. I’m not saying straight tuck is bad. I’m saying “cheap” and “cheap to use” are not the same thing, and factories love pretending they are.

Production-wise, the die-cutting happens first, then printing, then gluing, then folding. Depending on the supplier, glue application may happen on a separate finishing line after the printed board is cut and creased. On a clean production run, this is smooth. On a sloppy one, you get bad folding memory, weak corners, or a bottom that doesn’t fully lock. That’s why I like to ask factories which glue station they’re using and what board thickness they’ve tested. Yes, I ask boring questions. Boring questions save expensive headaches. Boring questions also save me from having to hear, “We thought it would be fine.” Fine is not a manufacturing strategy. A factory in Ningbo using 350gsm C1S artboard with water-based glue will behave differently from one in Dongguan using recycled CCNB and hot melt adhesive, and that difference shows up when 3,000 cartons are on a pallet.

Key Factors That Affect Performance and Pricing

If you want to price custom crash lock bottom boxes correctly, start with material. Board choice changes both the feel and the cost. SBS, CCNB, kraft, and corrugated all behave differently. For premium retail packaging, SBS gives you a smooth print surface and a clean, upscale look. CCNB can be more economical for larger runs. Kraft gives you a natural look, which works well for eco-minded package branding. Corrugated adds strength, but it also changes the box profile and shipping cost. A 350gsm C1S artboard with 1.5mm greyboard insert is a very different bill than a 24pt SBS carton with no insert, and the difference is usually visible in the hand.

I’ve seen brands chase the lowest unit price and then spend more on freight and replacements. That’s classic packaging math gone sideways. A 350gsm SBS carton with matte aqueous coating will cost more than a lighter 300gsm board, but if your product is brittle or your shelf presentation matters, that extra thickness may save the order. For custom crash lock bottom boxes, the board has to be thick enough to hold shape and still fold cleanly at the bottom lock. Too thin, and the base feels flimsy. Too thick, and the lock can get stiff or difficult to set on the line. I’ve had one buyer in Shanghai insist on “maximum thickness” and then wonder why the workers were fighting the cartons like they were trying to open a stubborn suitcase. We ended up stepping down from 400gsm to 350gsm, and suddenly the line stopped swearing at the box.

Print complexity matters too. A one-color kraft box is not the same price as a full-color CMYK run with soft-touch lamination, spot UV, and gold foil. Each finish adds setup, time, and waste. I’ve negotiated enough print jobs to know foil stamping especially can add real cost because it often needs a separate tool. On a 5,000-unit order, foil might add $0.06 to $0.18 per box depending on coverage and supplier. Embossing usually adds another layer of tooling and setup. Fancy is not free. Shocking, I know. If you want a soft-touch finish on custom crash lock bottom boxes, expect the cost to rise by around $0.03 to $0.07 per unit in many China-based factories, and that’s before anyone mentions plate setup.

Custom crash lock bottom boxes also come with tooling and setup realities. You may have plate charges for offset printing, die-cut tooling costs, and glue line setup fees. Small runs tend to cost more per unit because those fixed costs get spread across fewer pieces. For example, I’ve seen 1,000-unit custom printed boxes priced at $0.78 to $1.20 per box, while a 10,000-unit order with the same structure and print finish could drop to $0.24 to $0.42 per box, depending on board, coating, and freight. That range is real. It changes with factory location, season, and how messy your artwork file is. Messy artwork files have a way of making everyone’s life harder and your quote mysteriously higher. A clean 5,000-piece order in Shenzhen can land at about $0.15 per unit for a simple uncoated crash lock box, while a similar job with full-color print and matte lamination may sit closer to $0.28 per unit.

MOQ matters. A lot. Some factories will quote 3,000 units minimum for custom crash lock bottom boxes, while others want 5,000 or 10,000 depending on board and print method. If you’re ordering in smaller batches, expect a higher per-box cost. Also watch freight. A carton that seems cheap out of the factory can become much more expensive once ocean shipping, domestic trucking, and duties are included. I’ve had buyers cheer over a low carton quote, then quietly cry when they saw the landed cost. Happens more than you’d think. Sometimes I can see the emotion leave their face in real time. A carton quoted at $0.18 FOB Shenzhen can become $0.29 landed in Los Angeles once ocean freight, port fees, and inland trucking are added.

Supplier location also changes everything. Shenzhen, Dongguan, and Ningbo factories may quote differently based on labor rate, machine capacity, and access to board stock. Lead time affects pricing too. A standard 15 to 20 business day production slot is often cheaper than a rush job pushed into a 7 to 10 day window. If the plant has to interrupt scheduled runs, they will charge for it. Fair enough. They’re not a charity, and I’m not asking them to be one. A factory in Dongguan with a full finishing line may handle 20,000 units faster than a smaller plant in Wenzhou that has to outsource gluing. That difference matters when your launch date is fixed in the calendar.

For packaging standards and material considerations, I often point clients to industry resources like PMMI and the American Forest & Paper Association’s sustainability references through FSC. If your brand wants better environmental claims, don’t guess. Confirm the board and certification paperwork. Ask whether the paper stock is FSC-certified, whether the inks are soy-based or water-based, and whether the factory can provide documentation before you approve a 10,000-piece run.

How to Specify the Right Box for Your Product

Start with the product itself. Measure length, width, and height in millimeters if you can. Inches are fine too, but keep the units consistent. Then add clearance for inserts, closure space, and any product movement. If you’re fitting a serum bottle into custom crash lock bottom boxes, you may need 2 to 4 mm of extra room on each side depending on whether you’re using a paper insert, molded pulp tray, or EVA foam. For a 120mm x 45mm x 35mm bottle, I usually ask for the internal cavity to be at least 124mm x 49mm x 39mm if the cap is tall and the fit needs to feel premium instead of cramped.

One client sent me the product dimensions only and forgot the cap height. The box looked perfect on paper, then the bottle stood 6 mm too tall for the top closure. We fixed it, but it cost a week. That’s why I always tell people to measure the full retail unit, not just the body. With custom crash lock bottom boxes, the internal fit has to work with the bottom structure and the top closure. Otherwise the whole line gets annoying fast. And yes, “annoying” is the polite version. On a 2,000-unit run, that mistake would have cost them about $300 in re-sampling and delay charges, plus the cost of rescheduling packing labor.

Match the structure to the product weight and the way you sell it. If you’re shipping a lightweight skincare tube, a 300gsm SBS box may be enough. If you’re packing a 700g candle set or multiple glass bottles, step up the board weight, consider a stronger insert, and test the bottom lock under full load. The same goes for display cutouts. A window can improve shelf appeal, but it may reduce rigidity if the panel is too large. Good packaging design balances appearance with structure. Bad packaging design is what happens when someone picks the prettiest option and ignores the physics. A 40mm x 60mm window in a front panel might look nice, but if the carton is carrying a 1.2 lb product, you may need to move to thicker board or add an inner support tray.

Think about workflow too. If your warehouse team is packing 1,500 units a day, custom crash lock bottom boxes are attractive because they save time on assembly. If your crew is tiny and packing happens intermittently, the speed benefit still matters, but not as dramatically. Also ask whether the box needs a dust flap, a locking tab, or a hang hole. Retail packaging requirements often differ from ecommerce packaging. One box can do both, but only if you spec it properly. I’ve seen brands try to cram every possible feature into one carton and end up with a structure nobody liked. More features is not always better. Sometimes it’s just more features. If your box is heading to a retail shelf in New York and also shipping DTC from California, tell the factory both use cases before they quote.

Here’s the checklist I send before quoting:

• Exact product dimensions, including cap or closure height
• Product weight in grams or ounces
• Inside fit allowance for inserts
• Desired board type and thickness
• Print coverage: one color, full color, or PMS match
• Finish: matte, gloss, soft-touch, foil, embossing, spot UV
• Quantity target and reorder expectation
• Shipping destination and preferred delivery method

If you already know you need a broader packaging range, browse Custom Packaging Products and compare structures before you lock in the dieline. Sometimes the right answer is still custom crash lock bottom boxes. Sometimes it isn’t. I’d rather tell you that than pretend every carton is perfect for every item, which is what some suppliers do right before the invoice lands. A 5,000-piece order of custom crash lock bottom boxes at $0.17 per unit is fantastic only if the insert, coating, and shipping all match your actual use case.

Step-by-Step Process and Typical Timeline

The workflow for custom crash lock bottom boxes usually starts with a quote request. A decent supplier will ask for dimensions, quantity, board preference, print specs, and shipping address. If they don’t ask those things, that’s a small warning light. After quoting, the next step is dieline development or dieline confirmation. This is where structural accuracy lives or dies. In Shenzhen and Dongguan, a straightforward dieline usually comes back in 1 to 2 business days if your measurements are complete.

Once the dieline is approved, artwork prep begins. Your files need to match the correct template, with bleed, safe zones, and high-resolution images. A 300 dpi file is standard for print, and anything fuzzy gets expensive in the worst way: reprints. I’ve seen brands try to send a screenshot from a design tool and wonder why the text looked weak on the finished box. Print files are not a place to improvise. Trust me, the production team will spot the problem faster than you can say “Can we fix it on the fly?” For custom crash lock bottom boxes, ask for the template in AI or PDF format and confirm the trim, crease, and glue areas before anyone exports final art.

Sampling comes next. Depending on complexity, a plain white sample or digital proof may be ready in 2 to 5 business days. A fully printed prototype can take 7 to 12 business days, sometimes longer if foil or embossing is involved. For custom crash lock bottom boxes, I strongly prefer a physical sample if the product has weight, because the folding action and bottom lock need to be tested under real conditions. Paper proofs are nice. Real cartons are better. Paper can lie. Cartons don’t. A printed sample for a 350gsm C1S artboard run in Guangzhou may cost $45 to $120, depending on whether the factory uses digital proofing or a hand-cut mockup.

Then production starts. For a standard custom run, I usually see 12 to 20 business days from final approval to completion, not including shipping. Larger runs or more complex finishes can stretch to 25 business days. Freight can add another 5 to 35 days depending on whether you choose air, ocean, or domestic delivery. Rush orders are possible, but they raise costs. A factory may charge a rush fee of 10% to 25%, and that’s before you pay the shipping premium. No one is giving away speed for free. I wish they did. My inbox would be much less dramatic. If you approve a proof on Monday and the factory is in Ningbo, a typical delivery to a U.S. West Coast warehouse could land in 18 to 30 calendar days depending on sea transit and customs timing.

Here’s the realistic sequence I’ve used with clients ordering custom crash lock bottom boxes:

1. Request quote and confirm specs
2. Approve dieline and structure
3. Submit artwork or have design adjusted to template
4. Review proof and correct any errors
5. Receive sample and test fit/assembly
6. Approve final production
7. Run printing, cutting, gluing, and folding
8. Ship by air, sea, or ground

There are bottlenecks. Of course there are. Artwork revisions slow everything down. Structural changes slow everything down more. If your client suddenly decides the logo needs to move 8 mm after proof approval, expect delays. I once had a brand change the box height by 4 mm after the sample stage because the shelf display looked “a little crowded.” That 4 mm triggered a new dieline, a new sample, and a new approval chain. Packaging is not furniture. Tiny changes can ripple. Sometimes they ripple straight into a missed launch date. In one case, that 4 mm added 6 business days and about $180 in revised sampling costs from a factory in Shenzhen.

If you want to understand shipping impacts on packaging projects, the EPA has useful materials on waste reduction and packaging efficiency at EPA Sustainable Materials Management. That matters because better-fit cartons and lower shipping waste can help reduce total packaging burden, not just box cost.

Common Mistakes to Avoid When Ordering

The biggest mistake is measuring only the product and ignoring inserts, closures, or print bleed. With custom crash lock bottom boxes, a bad internal fit can wreck both appearance and function. If the carton is too tight, assembly gets harder and the product may scuff. If it’s too loose, the item shifts in transit and the unboxing feels cheap. Neither is good. Both are annoying. One of them also costs money. A 3 mm mistake on the internal width can be the difference between a clean shelf-ready fit and a box that bulges at the side panel.

Another common mistake is choosing the cheapest board without thinking about how the box will behave in real life. I’ve seen thin boards cause popping bottoms, crushed corners, and poor shelf presentation. A carton that saves $0.04 can cost you $0.40 in damage or rework. That’s not savings. That’s self-sabotage wearing a spreadsheet. And yes, I’ve watched people defend that decision with a straight face. In one case, a buyer in Hong Kong saved $200 on the carton order and then lost $1,100 replacing damaged goods after one warehouse drop test.

Artwork errors cause their own special kind of pain. Low-resolution logos, missing bleed, and ignored dielines are the classics. So is putting text too close to the edge and then acting surprised when it gets trimmed. For custom crash lock bottom boxes, the structure is already doing extra work. Don’t make the print layer fight the die line too. If the design team wants to get creative, great. Just not with the trim line. A 2 mm safe zone is not a suggestion. It is the line between “looks premium” and “why is the phone number cut off?”

Freight and storage get underestimated constantly. A run of 10,000 flat-packed cartons may seem compact, but it still occupies space and may require palletizing, storage, and domestic distribution. If you don’t account for that, your budget gets shredded after the order ships. And if the boxes arrive before your product does, you need room to store them dry and undamaged. Packaging is physical. You can’t email it into a warehouse. If only that worked. Ten thousand flat cartons can easily take 2 to 3 pallets, depending on size and board thickness, and that matters when your warehouse in Los Angeles charges by pallet position.

Finally, unclear specs create expensive back-and-forth. A factory can’t quote accurately if you say “medium size, premium feel, maybe glossy, maybe not.” That’s not a spec. That’s a mood. Give them dimensions, board thickness, print colors, finish, quantity, and shipping destination. Custom crash lock bottom boxes are easy to quote when the brief is clean. Sloppy briefs turn into delays, and delays burn cash. I’ve seen a two-line spec sheet save more time than a 20-email thread ever could. A proper brief should fit on one page and include carton size, material, print method, finish, target quantity, and delivery city like Los Angeles, Chicago, or Rotterdam.

Expert Tips, FAQs, and Next Steps

My first tip is simple: request a physical sample. Not a mockup on screen. A real box. If you’re ordering custom crash lock bottom boxes for a product with actual weight, test the sample with the full fill weight and close it 20 times. I did this once with a skincare brand that thought their jar was “light.” The sample held fine empty, but with product and insert it pressed the bottom lock harder than expected. We adjusted the board weight and avoided a bad production run. That little test saved a lot of future complaining. The final spec moved from 300gsm to 350gsm C1S artboard, and the client stopped worrying about bottom blowouts.

Second tip: compare quotes line by line. A low quote can hide plate charges, glue fees, artwork prep, freight to port, or domestic delivery. Ask for the breakdown. If Supplier A quotes $0.31 per unit and Supplier B quotes $0.37, but Supplier A adds $220 in hidden setup and $480 in freight handling, the “cheap” option may not be cheap at all. I’ve seen this exact trick happen with custom printed boxes more times than I care to count. The quote looks friendly until the invoice starts speaking a different language. A factory in Shenzhen that offers $0.15 per unit for 5,000 pieces may be honest, but only if you know whether that price includes glue, coating, and packing into master cartons.

Third tip: get material samples before committing. A board swatch tells you a lot. So does a print finish sample. Soft-touch lamination feels premium, but it can show fingerprints. Gloss can pop on retail shelving, but it may scratch more visibly. Kraft sends a natural message, especially for package branding with eco positioning. Custom crash lock bottom boxes can support all of those looks, but each one behaves differently in hand. Pick the finish your customer will actually touch, not just the one that photographs well under studio lights. If your retailer is in Chicago and your ecommerce team is shipping from Dallas, test the finish under real warehouse handling, not just under studio lights at 2 p.m.

Fourth tip: ask for flat dimensions and packed dimensions. Those numbers matter if you’re importing cartons or trying to reserve warehouse space. I once had a client budget for one pallet and end up with two because they ignored compression and pallet stacking limits. Fun. Expensive fun. The kind of fun nobody wants to repeat. A flat-packed stack of 5,000 cartons may seem harmless until you realize it needs 48 inches of rack depth and dry storage away from HVAC condensation.

If you’re still deciding whether custom crash lock bottom boxes are the right structure, here’s the short version. Choose them when you need faster assembly, better bottom support, and a more polished retail or ecommerce presentation. Skip them if your item is ultra-light, your budget is tiny, or your packaging workflow barely justifies a pre-glued structure. There’s no award for choosing the fanciest box possible. There is only the right box for the job. And if you’ve ever watched a production team wrestle with the wrong box, you know exactly what I mean. A 5,000-piece reorder from a factory in Dongguan can be the sweet spot if your monthly demand sits around 3,000 to 4,000 units and you want a little safety stock without overloading your warehouse.

For brands that care about sustainability claims, verify board sourcing and recycling information through FSC and compare structure choices against shipping efficiency. Better-fitting packaging can reduce damage and waste, which is one of the few times good logistics and good branding are on the same side. Ask for FSC paperwork, recycled content percentages, and whether the coating is water-based or UV-based before you sign off on a 10,000-unit print run.

My next-step checklist is straightforward:

• Measure the product with closure and insert clearance
• Decide on board type and finish
• Define print colors and branding goals
• Request a dieline from the supplier
• Approve a sample before mass production
• Test the box on your actual packing line

That’s the real difference between a box that looks good in a PDF and a box that performs in the warehouse. Custom crash lock bottom boxes can be a smart choice for speed, protection, and presentation, but only if the structure matches your product, your labor setup, and your budget. I’ve seen them save brands thousands. I’ve also seen them misused and turn into expensive little regrets. Choose carefully, spec clearly, and test early. Packaging is not glamorous, but neither is paying for avoidable mistakes. A 12- to 15-business-day production window from proof approval is perfectly reasonable when the brief is clean and the board is already confirmed.

The actionable takeaway is simple: before you place a mass order, get one physical sample of your custom crash lock bottom boxes, pack it with the real product, and time your team assembling it. If the box fights your line, fix the structure before production. If it works, move forward with confidence. That one test is usually the difference between a smooth launch and a warehouse headache you’ll be hearing about for weeks.

If you want to compare structures, finishes, and print options for your next run, start with Custom Packaging Products and ask for a sample that reflects your real product weight. That one step filters out most bad decisions before they become invoices. If your supplier in Shenzhen can’t send a sample within a week, keep looking.