What box for A4 documents and prints? Inside sizes and dim weight

A4 documents and prints measure 8.27 × 11.69 in (210 × 297 mm). With 1 in of cushioning on every side, a 1 in stack needs a box at least 13.69 × 10.27 × 3 in inside; a shallow die-cut mailer or a telescope box suits flat goods better than a deep slotted carton.

Inside sizes by stack thickness and cushioning

Stack, inCushion per sideInside box, inSuggested styleSmallest library size that fitsUSPS DWFedEx DW
0.50.512.69 × 9.27 × 1.5042714 × 10 × 4n/a2 lb
0.5113.69 × 10.27 × 2.5042716 × 12 × 4n/a4 lb
0.5215.69 × 12.27 × 4.5042716 × 14 × 8n/a8 lb
10.512.69 × 9.27 × 2042714 × 10 × 4n/a2 lb
1113.69 × 10.27 × 3042716 × 12 × 4n/a4 lb
1215.69 × 12.27 × 5042716 × 14 × 8n/a8 lb
20.512.69 × 9.27 × 3042714 × 10 × 4n/a3 lb
2113.69 × 10.27 × 4042716 × 12 × 4n/a5 lb
2215.69 × 12.27 × 6042716 × 14 × 8n/a9 lb
40.512.69 × 9.27 × 5042713 × 10 × 6n/a5 lb
4113.69 × 10.27 × 6042714 × 12 × 6n/a7 lb
4215.69 × 12.27 × 8030116 × 14 × 815 lb12 lb

Inside = item + 2 × cushion on each axis. Dimensional weight uses C flute outside dimensions (ID + 2 calipers on L and W, + 3 on depth); n/a means USPS bills actual weight below 1,728 in³. Divisors checked 2026-10-27. The suggested style is a rule of thumb: 0427 for depths to 6 in, 0301 beyond.

Packing notes

  • Keep flat goods flat: a box whose depth is far more than the stack invites shifting, so fill or reduce the depth.
  • Corners take the knocks; corner protectors or a rigid pad on each face protect edges better than loose fill.
  • Large sheets (11.69 in long side) fit common flat mailers without rolling.

Open this item in the Spec Builder to set your own thickness, weight and carriers.

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Sources