Every standard mailer box footprint in one reference chart — internal dimensions, external dimensions, cubic volume, billable DIM weight, and the products each size actually fits. Bookmark it; this is the chart our engineers start from on every custom run.
All sizes are listed as internal usable dimensions in the order Length × Width × Depth — the same convention used on every quote and dieline we produce. External dimensions run roughly 1/4 inch larger in each direction once both board walls and score tolerances are counted, and carriers measure the external size when billing. If you are measuring a product to match against this chart, add protection room first — our full method is in the guide on how to choose the right mailer box size.
Twelve footprints cover the overwhelming majority of e-commerce shipments, from a 4-inch cube for jewelry to the 14 × 12 × 5 bulk shipper.
| Internal Size (L×W×D) | External (Approx.) | Volume | DIM Weight | Best For | Recommended Style |
|---|---|---|---|---|---|
| 4" × 4" × 4" | 4.25" × 4.25" × 4.25" | 64 cu in | 0.5 lbs | Jewelry, samples, enamel pins, small accessories | Mini Mailer Boxes |
| 6" × 4" × 3" | 6.25" × 4.25" × 3.25" | 72 cu in | 0.5 lbs | Cosmetics, skincare jars, lip kits, pocket tech gadgets | Mini Mailer Boxes |
| 6" × 6" × 6" | 6.25" × 6.25" × 6.25" | 216 cu in | 1.6 lbs | Mugs, jar candles, gift sets, single fragile items with void fill | Tuck-Top Mailer Boxes |
| 8" × 6" × 3" | 8.25" × 6.25" × 3.25" | 144 cu in | 1.0 lbs | Soy candles, artisan soaps, coffee pouches, drinkware, electronics | Tuck-Top Mailer Boxes |
| 9" × 6" × 2" | 9.25" × 6.25" × 2.25" | 108 cu in | 0.8 lbs | Stationery kits, art prints, planners, paperbacks, thin gift sets | Flat Mailer Boxes |
| 9" × 6" × 3" | 9.25" × 6.25" × 3.25" | 162 cu in | 1.2 lbs | Small apparel, hardcover books, wellness kits, accessory bundles | Standard Mailer Box |
| 10" × 8" × 4" | 10.25" × 8.25" × 4.25" | 320 cu in | 2.3 lbs | The classic subscription box footprint — curated multi-product bundles | Subscription Mailer Boxes |
| 11" × 8.5" × 2" | 11.25" × 8.75" × 2.25" | 187 cu in | 1.3 lbs | Documents, tablets, certificates, flat electronics, photo books | Flat Mailer Boxes |
| 12" × 9" × 3" | 12.25" × 9.25" × 3.25" | 324 cu in | 2.3 lbs | Folded apparel, denim, knitwear, boutique clothing orders | Apparel Sleeve Mailer Boxes |
| 12" × 9" × 4" | 12.25" × 9.25" × 4.25" | 432 cu in | 3.1 lbs | Footwear, handbags, hoodies, large subscription and gift collections | Subscription Mailer Boxes |
| 12" × 12" × 4" | 12.25" × 12.25" × 4.25" | 576 cu in | 4.1 lbs | Gift crates, multi-item retail sets, PR and influencer kits | Custom Mailer Boxes |
| 14" × 12" × 5" | 14.25" × 12.25" × 5.25" | 840 cu in | 6.0 lbs | Winter outerwear, bulk retail packs, wholesale fulfillment orders | Custom Shipping Boxes |
Need the printable version for your packing bench? The same standard footprints are quoted instantly on any product page — start from the standard mailer box and adjust dimensions in the quote form.
Two rows of this chart deserve a callout. The 10" × 8" × 4" is the classic subscription footprint: deep enough for a curated bundle of bottles, jars, and soft goods, small enough to keep DIM weight near 2.3 lbs. The 12" × 9" × 4" is its big sibling for apparel-led and premium boxes. Programs standardize on one of these for a structural reason beyond fit — a fixed footprint means a standing dieline, identical packing SOPs every month, and freight rates your finance team can forecast. If you run a recurring program, start with our subscription mailer boxes — they are built around exactly these two footprints, with seasonal artwork swaps on the same dieline.
Standard sizes are a starting grid, not a limit. A product that rattles in the nearest standard footprint costs you void fill on every order and DIM-weight penalties on many of them — a custom dieline cut to your exact product usually pays for itself within the first production run. Our engineers generate custom CAD dielines within 24 hours at zero engineering fee, in any dimension the converting lines can fold. Browse the full custom mailer boxes specification or work through the sizing method in our size selection guide before you commit.
Every footprint in this chart is in production today. Get exact per-unit pricing at your quantity with our mailer box cost guide, or configure your size now.