Priority Mail Small Box
Jan. 12, 2025
Flat Rate Shipping: What Are USPS Flat Rate Boxes | ShippingEasy USPS Flat Rate Boxes, Envelopes, & Pricing - EasyPost Foil Insulated Box Liners - 8.5" x 1.5" x 5.25" (Fits in USPS Small Priority Mail Boxes) Priority Mail Small Box