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USPS · USPS Rates and Services Knowledge

What is the maximum size for a standard USPS Priority Mail flat-rate envelope?

Correct answer

12.5" × 9.5" (the large flat-rate envelope dimensions)

  1. A Any size as long as it fits
  2. B 12.5" × 9.5" (the large flat-rate envelope dimensions)
  3. C 8.5" × 11" only
  4. D Unlimited — flat rate means any size

Why this is the answer

USPS flat-rate envelopes are sized containers provided by USPS — they are not any envelope. The large flat-rate envelope is 12.5" × 9.5". Other flat-rate envelope options: padded flat-rate envelope (12.5" × 9.5" padded) and legal flat-rate envelope (15" × 9.5"). 'Flat rate' means a fixed price regardless of weight (up to 70 lbs) and destination, not unlimited size.
Source: USPS 477 VEA, Priority Mail Flat Rate

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