Pack of 10 or 25 15" (L) x 12" (W) x 3-1/8" (H) $0.00 Priority Mail® Forever Prepaid Flat Rate Small Box Includes Customer's Return Address 8-11/16" (L) x 5-7/16" (W) x 1-3/4" (H) $12.60

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 …

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.

Jan 5, 2026 · A practical guide to USPS flat rate boxes. Sizes, dimensions, pricing, and when flat fee shipping with USPS makes sense for businesses.

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 …

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.

Nov 7, 2025 · Discover how to select the right shipping box sizes for USPS, UPS & FedEx. Minimize DIM-weight fees, fit carrier rules, and cut fulfilment costs.

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.