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ULINE
Easy Seal Side Load Boxes | In Stock – Ships Today
https://www.uline.com/Uline/Boxes
AdUline's version of UPS Next Day Air®, FedEx Express® and USPS Priority Mail boxes. Assembles easily without glue or tape. Adhesive strips on both ends. Ships flat.

USPS® Flat Rate Pricing | Affordable Mailing Services