These boxes must be used with Priority Mail Flat Rate postage; you cannot use them for UPS, FedEx, or standard USPS Ground shipping.

Some retailers like Office Depot/OfficeMax may stock them as they offer USPS shipping services. 📦 Box Options & Sizes Typical Dimensions (Outside) Small Flat Rate Jewelry, small electronics, or brochures 8 11/16″ x 5 7/16″ x 1 3/4″ Medium Flat Rate (Top Loading) Shoes, office supplies, or heavy tools 11 1/4″ x 8 3/4″ x 6″ Medium Flat Rate (Side Loading) Clothing, framed photos, or thin laptops 14 1/8″ x 12″ x 3 1/2″ Large Flat Rate Larger gifts, laptops, or board games 12 1/4″ x 12″ x 6″ Source: USPS Priority Mail Products ⚠️ Important Rules

Most USPS locations keep these boxes in their lobbies or behind the counter.

You can order boxes in packs of 10 or 25 at the USPS Postal Store and they will ship them to your home for free within 2–5 business days.

The box must be able to close normally without bulging or being taped into a different shape.

Boxes have a maximum weight limit of 70 lbs for domestic shipping.