Mailer Size Chart: Bubble, Poly & Corrugated Sizes
Every mailer size on one page: bubble mailers (#000–#7), poly mailers, corrugated and literature mailers, and rigid mailer boxes. All sizes are usable inside dimensions, width x length — measure your item flat and size up half an inch if it’s rigid.
Bubble mailer sizes (#000 to #7)
| Size code | Usable inside dimensions |
|---|---|
| #000 | 4 x 8" |
| #00 | 5 x 10" |
| #0 | 6 x 10" |
| #1 | 7.25 x 12" |
| #2 | 8.5 x 12" |
| #3 | 8.5 x 14.5" |
| #4 | 9.5 x 14.5" |
| #5 | 10.5 x 16" |
| #6 | 12.5 x 19" |
| #7 | 14.25 x 20" |
Full detail — what fits each number, padded vs unpadded fit rules, and case pricing on 148 bubble mailers — is on the bubble mailer size chart.
Poly mailer sizes
Standard poly mailer sizes: 6 x 9" · 7.5 x 10.5" · 9 x 12" · 10 x 13" · 12 x 15.5" · 14.5 x 19" · 19 x 24". Lightweight, tear-resistant, and the cheapest way to ship soft goods; see the poly mailer size chart or shop 69 poly mailers.
Corrugated & literature mailer sizes
Rigid corrugated mailers protect flat and shallow items without a full box. Popular stocked sizes have their own pages with live case pricing: 8x7x4, 8x7x3, 13.5x3.5x3.5, and 17.5x3.5x3.5. Background: the literature mailers guide and chipboard mailers guide.
Mailer box sizes
Rigid mailer boxes (roll-end tuck-top cartons) suit subscription and retail-presentation shipping. Browse 644 mailer boxes, or compare formats in mailer box vs corrugated mailer.
Find a mailer by dimension
Need a specific width or length? The mailer directory by dimension lists every stocked footprint; 6x10 mailers have a dedicated buying guide. For flat-but-long items, consider mailing tubes instead.
Shop all mailersMailer vs box: which to ship in
Frequently asked questions
How do I measure a mailer size?
Mailer sizes are usable inside dimensions, width x length, measured with the mailer flat. The outside runs about half an inch larger, and bubble lining reduces usable space more than poly. Size up if your item is rigid or within half an inch of the stated size.
What do bubble mailer numbers like #0 or #2 mean?
The number is a standard size code that runs from #000 (4 x 8 inch) up to #7 (14.25 x 20 inch). Every carrier and brand uses roughly the same ladder, so a #2 is 8.5 x 12 inch usable regardless of who makes it.
Should I use a mailer or a box?
Mailers win on cost and dimensional weight for soft, flat, or padded-tolerant items; boxes win for rigid, fragile, or stacked contents. The mailer vs box guide walks the decision, and corrugated mailers split the difference for flat rigid items.