Poly Mailer Size Guide: Measure Clothing & Check Cubic

Enter folded clothing dimensions, choose a mailer that closes without strain, and pre-check the current USPS Ground Advantage soft-pack cubic tier before measuring the sealed parcel.

Optional starting preset

Presets restore the fast category shortcut, but they are examples only. Replace every preset with the exact folded item measurements before ordering bags.

Folded length

Folded width

Natural thickness

Finished packed weight

This is a pleated or expandable mailer. Use three-dimensional cubic measurement instead of the unused-bag length-plus-width shortcut.

Sample-pack decision

Start with 12 × 15.5 in

Pack one representative order, confirm the adhesive closes flat, weigh and remeasure it, then compare the live label quote.

Opening needed

8.5 × 13.5 in

Thickness + 2 in closure allowance

GA cubic pre-check

Candidate tier 0.3

Original-bag tier; final eligibility still requires the sealed parcel

Unused bag L + W

27.5 in

Non-pleated shortcut must be ≤36 in

This is a fit starting point, not a guarantee. Seal and remeasure one sample before ordering in bulk.

Stock-size test ladder

Buy samples before cases. A mailer only passes when the item slides in, the adhesive closes on a flat surface, and sharp or rigid parts cannot puncture it.

6 × 9 in

L + W: 15 in

9 × 12 in

L + W: 21 in

10 × 13 in

L + W: 23 in

12 × 15.5 in

L + W: 27.5 in

14.5 × 19 in

L + W: 33.5 in

19 × 24 in

L + W: 43 in

Use a box instead: shoes with retail boxes, structured hats, glass, electronics, hard collectibles, sharp hardware, or anything whose resale value depends on shape and corner protection.