12x12x4 Boxes
Updated August 1, 2026
Prices are live catalog prices.
12x12x4" corrugated boxes in stock — exact inside dimensions, grade stamped on every listing, bundle quantities with per-box pricing shown, shipped from 5 US regional warehouses.
| Product | Price (per bundle) | Per box |
|---|---|---|
| 12x12x4 Shipping Boxes — ECT-32 Kraft Corrugated, 25-Pack | $26.65 / 25 | $1.07 |
| 12x12x4 White Corrugated Boxes ECT-32 Single Wall - Bundle of 25 | $49.25 / 25 | $1.97 |
| 12x12x4 Kraft Deluxe Literature Mailers - Crush Proof, 50-Pack | $155.71 / 50 | $3.11 |
| 12x12x4 Corrugated Mailers - White Literature, 50-Pack | $119.25 / 50 | $2.38 |
| 12x12x4 Kraft Literature Mailers - Self-Seal Corrugated, 50-Pack | $111.03 / 50 | $2.22 |
Sizing note: dimensions are inside measurements (L x W x H); your item should clear each by about 1/4". Nearby sizes: small · medium · large · size chart.
Frequently asked questions
Are 12x12x4 dimensions inside or outside?
Inside. The usable interior is 12x12x4"; outside runs roughly 1/8–1/4" larger per wall by grade.
Do 12x12x4 boxes ship flat?
Yes — corrugated boxes ship flat in bundles and fold to shape. Bundle counts and per-box pricing are on each product page; freight is quoted live at checkout.