Most USPS locations keep these boxes in their lobbies or behind the counter.
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 where to buy if it fits it ships boxes
You can pick up individual boxes or packs in person, or have them delivered to your home: Most USPS locations keep these boxes in their