Free USPS Priority Mail Boxes To Become Smaller

The USPS has announced they will be reducing the size of some free Priority Mail boxes and envelopes. Two Priority Mail envelopes and six Priority Mail boxes will be getting smaller, with the reductions ranging from 1/8″ smaller in length on the Priority Mail Tyvek envelope to 2 1/2″ smaller in width on the Priority Mail Regional Rate Box B.

The USPS states these changes are being made to help process Priority Mail boxes and envelopes more efficiently on their sorting equipment, reducing the need for manual package sortation.

Priority Mail Box Size Changes

ItemServiceUSPS Store SKUOLD Outside DimensionsNEW Outside DimensionsSummary of Change
EnvelopePriority Mail Tyvek EnvelopeEP1411-5/8” (W) x 15-1/8” (L)  11-5/8” (W) x 15” (L)  Length of envelope is getting smaller by 1/8"
EnvelopePriority Mail APO/FPO Tyvek Envelope (Mili-Pac)MILIPAC11-5/8” (W) x 15-1/8” (L)  11-5/8” (W) x 15” (L)  Length of envelope is getting smaller by 1/8"
BoxPriority Mail Large Flat Rate BoxLFRB6” (H) x 12-1/4” (W) x 12-1/4” (L)  6” (H) x 12” (W) x 12-1/4” (L)Width of box is getting 1/4" smaller
BoxPriority Mail APO/FPO Large Flat Rate BoxMILIFRB6” (H) x 12-1/4” (W) x 12-1/4” (L) 6” (H) x 12” (W) x 12-1/4” (L)Width of box is getting 1/4" smaller
BoxPriority Mail0-1092 Box 2-7/8” (H) x 12-1/4” (W) x 13-11/16” (L)2-7/8” (H) x 12” (W) x 13-11/16” (L)Width of box is getting 1/4" smaller
BoxPriority Mail0-1095 Box3-1/8” (H) x 12-1/2” (W) x 15-5/8” (L)3-1/8” (H) x 12’ (W) x 15” (L)Width of box is getting 1/2" smaller, length getting 5/8" smaler
BoxPriority Mail Regional Rate Box BRRB-B23” (H) x 14-1/2” (W) x 16-1/4” (L)3” (H) x 12” (W) x 15” (L)Width of box is getting 2 1/2" smaller, length is getting 1 1/4" smaler
BoxPriority MailBox 78-1/2” (H) x 12-1/4” (W) x 12-1/4” (L) 8-1/2” (H) x 12” (W) x12-1/4” (L) Width of box is getting 1/4" smaller

Online retailers who have extra stock of the older box sizes will still be able to use the USPS free shipping supplies until their boxes and envelopes are exhausted. The new box sizes started shipping from the site in late September 2021.

Eric Nash

Published by
Eric Nash

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