Amazon FBA packaging really boils down to a short checklist, honestly. Each unit has to survive a warehouse, each unit shows one barcode a scanner can read, and your shipping cartons stay inside Amazon’s size, weight and strength limits. Nail that and most shipments check in fine. Miss one bit and it’s prep fees, delays, or a pile of units coming back to you.
Amazon keeps the details in Seller Central and tweaks them every so often, so please check the current pages for your category. What we cover here is the practical side, what the rules usually say, how they actually play out on a packing table, and where we see sellers lose money.
Packaging, Prep and Labeling Are Three Different Jobs
People mix these up constantly. Packaging is the physical stuff (the product box, the poly bag, the bubble wrap), prep is whatever you do to make a unit warehouse-ready, so bagging a hoodie, bundling a set, wrapping a glass bottle or taping shut a box that keeps popping open, and labeling is the barcode side, mostly FNSKU stickers and carton labels.
All three at once. A gorgeous printed box with a label peeling off fails check-in, and so does a perfect label on a flimsy carton that got crushed somewhere in Ohio. Amazon has also been pulling back on the prep it’ll do for US sellers, so we’d plan on doing all of it yourself or through a prep center.
Amazon FBA Packaging Rules for Individual Units
Think about what happens to one unit. It gets picked, dropped into a tote, and tossed into a shipping box with somebody else’s order. It has to live through that. A few category rules come up again and again:
- Apparel and loose stuff goes in a clear poly bag, 1.5 mil thick or more.
- Any bag with an opening of 5 inches or wider needs a printed suffocation warning on it.
- Glass should live through roughly a 3 foot drop onto a hard floor.
- Liquids want a sealed cap, and often a second seal or a bag over that.
- Sets get a “Sold as set, do not separate” label, otherwise they get split.
Do the drop test yourself, it takes two minutes. Waist height, onto concrete, once on a face, once on an edge, once on a corner. Hear a rattle or a crack? Then add an insert or go to a sturdier box. A properly sized custom product box with a fitted insert often handles it with no bubble wrap at all (and it looks a lot nicer when the customer opens it).
Shipping Cartons: Size, Weight and Box Strength
The cartons going into Amazon have limits of their own. Standard ones usually can’t go past 25 inches on any side, and they shouldn’t weigh over 50 pounds unless one single item is heavier than that, in which case you need “Team Lift” or “Mechanical Lift” labels on it. Six-sided boxes. All flaps intact. And pull off or cover every old shipping label, because the scanner will happily grab the wrong one.
Box strength gets underrated. Your carton might sit at the bottom of a pallet stack for days with a lot of weight on it, so for normal goods most sellers go single wall corrugated rated ECT 32 (roughly the old 200 lb test), and double wall for heavy or fragile loads. Not sure which you need? This comparison of single, double and triple wall boxes should help. For dunnage, Amazon typically lets you use bubble wrap, full paper sheets, air pillows and foam sheets. Not packing peanuts though, and not shredded paper.
Labels: FNSKU, Carton IDs and Old Barcodes
Each unit gets one FNSKU, the Amazon barcode tied to your seller account, unless Amazon lets you use manufacturer barcodes for that product. The big rule is one scannable barcode showing on the outside of a unit. Just one. So if there’s already a UPC printed on your box, stick the FNSKU over it, or at least put the FNSKU where it gets scanned first, and always on a flat spot, never wrapped round a corner or slapped over a seam.
Every shipping carton gets its own box ID label too, on a side, not across the tape. Keep it off the edges where it scuffs. One trick we like if your volume’s high enough is printing the FNSKU straight into your box artwork, which kills a whole labeling step on every single unit.
A Worked Example: 120 Glass Jar Units
Let’s say you sell a 12 oz candle in a glass jar. Boxed, it’s about 3.5 x 3.5 x 4 inches and roughly 1.4 pounds, and you’re sending 120 of them.
Packing 48 to a carton feels efficient. Problem is 48 times 1.4 is over 67 pounds, way past the 50 pound guideline. So drop to 24 per carton, a 4 x 3 grid, two layers with a corrugated pad between them, and you end up with a carton about 15 x 11.5 x 9 inches at roughly 36 pounds, which is easy to lift, well inside the limits, and five cartons total. It’s glass, so we’d pay the little extra for double wall. Carton size drives freight cost too, and our guide on how box dimensions affect shipping cost gets into the dimensional weight side.
Where Branded Boxes Fit In
Amazon doesn’t care if your unit box is printed. Your customers do.
A plain brown box with a sticker on it kind of screams reseller, and a printed box cut to the product’s size usually shows up in better shape anyway, since there’s less room for it to rattle around. For outer cartons we’d go plain custom shipping boxes built around your exact unit count, which means less void fill and less freight you’re paying for air. Heavier loads? Look at the full range of corrugated shipping boxes.
Plenty of Amazon sellers run their own store on the side, and ecommerce boxes that double as the FBA unit package keep life simpler. Our minimums at The Pioneer Packaging are often around 50 boxes depending on the style, so you can test a new SKU before a big run, and shipping’s free anywhere in the USA, your prep center included.
Amazon FBA Packaging FAQs
Can I reuse old boxes for FBA shipments?
Yes, if they’re sturdy, six-sided, and every old label and barcode is gone or fully covered. Tired, crushed boxes cause a lot of damage claims.
Do I need a poly bag if my product is already boxed?
Usually no, as long as the box is sealed and won’t pop open on the way. Bags are mostly for apparel, soft goods and anything with loose parts.
What’s the most common reason FBA shipments run into problems?
Barcodes, nine times out of ten, two scannable codes on one unit or a label stuck on a curve or a seam. Overweight cartons come a close second.
Want product boxes or cartons built around your FBA units? Send us your product dimensions and we’ll quote you a few options.
Related reading: Custom Boxes for Amazon FBA Sellers.