Mailer boxes
The tuck-top mailer sizes Teal quotes most often, from small accessory boxes to subscription kits. Every size is custom-printed and any dimension in between is available.
Size reference
Standard Box Sizes Chart
Common mailer box, shipping carton, shoe box and USPS flat rate box sizes in one chart, with a finder that takes your product's dimensions and clearance and returns the closest standard size, its volume and its dimensional weight.
Free to use, no login, nothing you type leaves your browser.
50-unit minimum
Free dieline and proof
Free US shipping
30+sizes listed
USPSflat rate dims
Freedieline + proof
50unit minimum
Key Takeaway
The Standard Box Sizes Chart lists the box sizes buyers ask for most, as inside dimensions in inches: mailer boxes from 6 x 4 x 2 to 14 x 10 x 6, cube and rectangular shipping cartons from 6 x 6 x 6 to 24 x 24 x 24, common shoe box sizes, and the interior dimensions of USPS Priority Mail flat rate boxes. A finder on the page takes your product's dimensions and clearance and returns the closest listed size with its volume and dimensional weight. Any size on the chart, or any size in between, is custom-made by Teal Packaging, a US-based packaging supplier, from a 50-unit minimum with free dieline design, a digital proof and free US shipping.
Questions or ready for a quote? Contact Teal Packaging at info@tealpackaging.com or (224) 546-8325.
Mailer box sizes
Tuck-top mailer boxes, inside dimensions. These are the sizes Teal quotes most often; every one is custom-printed and any size in between is available from 50 units.
| Size (L x W x H) | Cubic inches | DIM weight at 139 | Typical use |
|---|---|---|---|
| 6 x 4 x 2 in | 48 | 0.35 lb | Jewelry, accessories, small cosmetics |
| 8 x 6 x 3 in | 144 | 1.04 lb | Skincare sets, supplements, candles |
| 10 x 8 x 4 in | 320 | 2.30 lb | Apparel, books, small kits |
| 12 x 10 x 5 in | 600 | 4.32 lb | Subscription boxes, shoes, gift sets |
| 14 x 10 x 6 in | 840 | 6.04 lb | Bundles, larger subscription kits |
Shipping carton sizes
Regular slotted cartons in the cube and rectangular sizes stock suppliers carry. Matching a custom-printed carton to one of these keeps pallet patterns simple.
| Size (L x W x H) | Cubic inches | Cubic feet | DIM weight at 139 |
|---|---|---|---|
| 6 x 6 x 6 in | 216 | 0.125 | 1.6 lb |
| 8 x 8 x 8 in | 512 | 0.296 | 3.7 lb |
| 10 x 10 x 10 in | 1,000 | 0.579 | 7.2 lb |
| 12 x 12 x 12 in | 1,728 | 1.000 | 12.4 lb |
| 14 x 14 x 14 in | 2,744 | 1.588 | 19.7 lb |
| 16 x 16 x 16 in | 4,096 | 2.370 | 29.5 lb |
| 18 x 18 x 18 in | 5,832 | 3.375 | 42.0 lb |
| 20 x 20 x 20 in | 8,000 | 4.630 | 57.6 lb |
| 24 x 24 x 24 in | 13,824 | 8.000 | 99.5 lb |
| 12 x 9 x 4 in | 432 | 0.250 | 3.1 lb |
| 12 x 12 x 6 in | 864 | 0.500 | 6.2 lb |
| 16 x 12 x 8 in | 1,536 | 0.889 | 11.1 lb |
| 18 x 14 x 10 in | 2,520 | 1.458 | 18.1 lb |
| 20 x 16 x 12 in | 3,840 | 2.222 | 27.6 lb |
| 24 x 18 x 18 in | 7,776 | 4.500 | 55.9 lb |
USPS Priority Mail flat rate boxes
Interior dimensions. Useful when a custom mailer has to nest inside a flat rate box. USPS revises specifications, so confirm on usps.com before you commit a print run.
| Box | Interior (L x W x H) | Cubic inches |
|---|---|---|
| Small flat rate | 8 5/8 x 5 3/8 x 1 5/8 in | 75 |
| Medium flat rate, top-loading | 11 x 8 1/2 x 5 1/2 in | 514 |
| Medium flat rate, side-loading | 13 5/8 x 11 7/8 x 3 3/8 in | 546 |
| Large flat rate | 12 x 12 x 5 1/2 in | 792 |
Shoe box sizes
From Teal's shoe box dimensions guide, inside dimensions by category.
| Category | Size (L x W x H) |
|---|---|
| Men's sneakers, standard | 13 x 7.5 x 4.5 in |
| Women's sneakers, standard | 12 x 6.5 x 4 in |
| Children's sneakers | 9 x 5 x 3.5 in to 11 x 6 x 4 in |
| Wide fit or chunky sole | 13.5 x 8 x 5 in |
| Ankle boots | 13 x 8 x 5 in |
| Mid-calf boots | 14 x 9 x 6 in |
| Knee-high boots | 15 x 10 x 6.5 in |
| Work boots and heavy-duty styles | 14 x 9 x 7 in |
| Women's heels and pumps | 12 x 6 x 4 in |
| Men's dress shoes | 13 x 8 x 4.5 in |
| Wedges and platforms | 12 x 7 x 5 in |
| Strappy sandals | 12 x 6.5 x 3.5 in |
How to read the chart
Sizes are inside dimensions in inches, listed length x width x height, because inside size is what has to fit your product.
Shipping cartons
Cube and rectangular regular slotted cartons in the sizes stock suppliers carry, useful when a custom-printed box should still match a standard cube on the pallet.
USPS flat rate
Interior dimensions of the Priority Mail flat rate boxes, useful when a custom mailer must nest inside one. Confirm current specifications on usps.com before you commit.
Then quote the exact box
Your numbers carry straight into the quote. A free dieline and a digital proof come back before anything prints, from a 50-unit minimum.
Clearance
Add 1/4 in for a snug retail fit, 1/2 in as the standard, and 1 in when inserts or fragile goods need room. The finder does this for you.
DIM weight
Two boxes with the same inside size can bill differently by carrier. The finder shows DIM weight at the 139 divisor FedEx and UPS use for retail rates.
Custom beats standard
A box sized to your product removes void fill and often drops a DIM tier. Teal makes any size from 50 units.
Shoe boxes
Sizes by category come from Teal's shoe box dimensions guide, which also covers lids, inserts and board choices.
Quote this spec
Your result is already filled in below. Add quantity and where to send the proof.
Link to this tool
Free to use and free to link. Paste this into a resource page, a course, a blog post or a forwarder's help center.
Or cite it as: Standard Box Sizes Chart, Teal Packaging, https://tealpackaging.com/standard-box-sizes-chart/
Questions buyers ask
What are the most common mailer box sizes?
For ecommerce, 6 x 4 x 2, 8 x 6 x 3, 10 x 8 x 4, 12 x 10 x 5 and 14 x 10 x 6 in cover most products from accessories to apparel and subscription kits. Teal prints all of them and any size between.
What are the USPS flat rate box sizes?
Interior dimensions: Small 8 5/8 x 5 3/8 x 1 5/8 in; Medium top-loading 11 x 8 1/2 x 5 1/2 in; Medium side-loading 13 5/8 x 11 7/8 x 3 3/8 in; Large 12 x 12 x 5 1/2 in. Confirm on usps.com, since USPS revises specifications.
Are box sizes inside or outside dimensions?
Box sizes are quoted as inside dimensions unless stated otherwise. Outside dimensions add the board thickness on each side, about 1/16 in for E-flute and 1/8 in for B-flute, which is what carriers measure.
How do I pick a box size for my product?
Measure the product at its widest points, add clearance (1/4 to 1 in depending on protection), and choose the smallest box that fits; then check the dimensional weight so the size does not push you into a higher shipping tier. The finder above does all three.
Can I order a size that is not on the chart?
Yes. Every Teal box is custom-made to your dimensions from a 50-unit minimum, with free dieline design, a digital proof before printing and free US shipping. Production runs from about 7 business days after proof approval.
