Ship packages for one flat rate regardless of weight (up to 70 lbs) or distance within the United States. Perfect for heavy items going long distances. All Flat Rate services include tracking and up to $100 of insurance coverage.
Ship packages for one flat rate regardless of weight (up to 70 lbs) or distance within the United States. Perfect for heavy items going long distances. All Flat Rate services include tracking and up to $100 of insurance coverage.
1-3 business days nationwide
Up to $100 coverage at no extra cost
No zones - flat rate to any US destination
Effective July 13, 2025 • Same price to any US destination
| Service Option | Dimensions | Weight Limit | Rate |
|---|---|---|---|
|
Flat Rate Envelope
Standard envelope
|
12½" × 9½" | 70 lbs | $9.70 |
|
Legal size documents
|
15" × 9½" | 70 lbs | $10.20 |
|
Padded Flat Rate Envelope
Bubble-lined protection
|
12½" × 9½" | 70 lbs | $10.50 |
|
Small Flat Rate Box
Compact items
|
8⅝" × 5⅜" × 1⅝" | 70 lbs | $10.60 |
|
Medium Flat Rate Box
Most popular option
|
11" × 8½" × 5½" or 14" × 12" × 3½" |
70 lbs | $18.50 |
|
Large Flat Rate Box
Maximum capacity
|
12" × 12" × 5½" or 24" × 12" × 3" |
70 lbs | $27.10 |
|
Military/APO Large Flat Rate
Special military pricing
|
Same as Large Box | 70 lbs | $25.85 |
Compare Flat Rate with Priority Mail weight-based pricing. Flat Rate is typically better for:
Get commercial pricing discounts and compare all USPS services instantly
