Bubble Mailer Sizes Explained: The #000 to #7 Guide (2026)
Key takeaways
- Bubble mailer numbers refer to usable interior size, from #000 (4×8 in) to #7 (14.25×20 in).
- Add ½–1 in of clearance; between two sizes, the smaller one usually protects better.
- A #0, #2 and #5 cover about 90% of orders for most sellers.
Bubble mailers use a numbering system — #000, #0, #1, up to #7 — that tells you nothing until someone explains it. Order the wrong number and your product rattles around or won't fit. Here's exactly what each size measures and how to choose.
The bubble mailer size chart
Sizes refer to the usable interior (width × length), not the outer dimension. The industry-standard sizes:
- #000 — 4 × 8 in — jewelry, SIM cards, small parts
- #0 — 6 × 10 in — cosmetics, phone cases, patches
- #1 — 7.25 × 12 in — small books, sunglasses
- #2 — 8.5 × 12 in — apparel, paperbacks
- #3 — 8.5 × 14.5 in — larger apparel, folders
- #4 — 9.5 × 14.5 in — hardcovers, small electronics
- #5 — 10.5 × 16 in — shoeboxes (slim), tablets
- #6 — 12.5 × 19 in — larger boxed goods
- #7 — 14.25 × 20 in — the biggest standard mailer
How to pick the right size
Measure your product flat (width and length), then add about ½–1 inch of clearance so it slides in without forcing the seal. If your item is thick or rigid, size up — the padded walls need room to wrap. When you're between two numbers, the smaller one usually protects better (less movement) and costs less.
Standardize to 2–3 sizes and save
The single biggest way to lower your mailer cost isn't finding a cheaper price — it's carrying fewer sizes at higher volume. Most sellers can cover 90% of their orders with two or three sizes (say a #0, a #2, and a #5). Buying those by the case or pallet beats stocking a dozen odd sizes at low volume each.
Kraft vs. poly bubble
Two constructions: kraft bubble mailers (paper outer, classic look) and poly bubble mailers (plastic outer, water-resistant, lighter). Same sizing either way — pick based on the look you want or how much moisture protection you need.
Shop by size
Browse every size from #000 to #7 — kraft, white, poly, and colors — in our Bubble Mailers collection, factory-direct and shipped in 24–48 hours. Selling on Amazon? See the seller lineup on our For Amazon Sellers page. New customers get 10% off a first order with code PRONTO10.
FAQ
What size is a #0 bubble mailer? About 6x10" usable interior — the common pick for cosmetics, phone cases and patches.
Do bubble mailer sizes refer to inside or outside dimensions? The usable interior. Measure your product flat and add ½–1" of clearance so it slides in without forcing the seal.
How many bubble mailer sizes should I stock? Two or three. Most sellers cover around 90% of orders with something like a #0, a #2 and a #5 — fewer sizes at higher volume costs less.
What size is a #5 bubble mailer? About 10.5 × 16 in usable interior, the usual pick for slim shoeboxes and tablets.
Buying at volume?
Our wholesale line sheet publishes per-unit pricing by pallet tier — no quote request needed to see numbers. Want to touch the product first? The $29 sample kit covers six product lines and is credited in full against your first wholesale order.
See the line sheetOrder the $29 sample kit
Questions? Call (619) 703-0245 — we manufacture our poly & bubble mailers in Tijuana and ship from U.S. inventory.