Set of 1 9-5/8" (L) x 7-3/4" (W) x 6-1/4" (H) $0.00 Priority Mail® Forever Prepaid Flat Rate Large Box Includes Customer's Return Address 12-1/4" (L) x 12" (W) x 6" (H) $31.40

Oct 5, 2025 · USPS has several pricing tiers that can dramatically impact the shipping rates you receive for your packages. USPS Retail Pricing is the starting tier for pricing. This is the USPS …

Jan 9, 2024 · Small USPS Flat Rate boxes start at $8.45 (unless you have a commercial account) and are ideal for shipping a smartphone-sized item. On the top end, large USPS Flat Rates …

6 days ago · A practical guide to USPS flat rate boxes. Sizes, dimensions, pricing, and when flat fee shipping with USPS makes sense for businesses.

Sep 4, 2025 · Learn all about USPS boxes, including types, costs, free options, and shipping tips to help you save money and choose the right packaging for your business.

Discover USPS flat-rate box dimensions—small, medium, large, APO/FPO tiers—and when flat-rate boxes offer the best value. Includes dimensions, weight limits, and specialty options.

Use our Priority Mail Flat Rate Envelopes or Boxes that come in standard sizes so you don't have to worry about measuring them. When sealing a Flat Rate Envelope or Box, the container …

Sep 5, 2024 · USPS boxes come in small, medium, and large sizes with different dimensions and costs. Learn about USPS's different boxes here.

The table below shows options for diferent Priority Mail Boxes and Envelopes, along with dimensions, online postage pricing and weight options.

Learn about the different box sizes, envelope dimensions, and pricing to determine the best choice for your shipping needs, whether you're sending documents or large items across the U.S.