BOX USA Rigid Mailers 18" x 24" (50-Pack) - Cardboard Mailer Envelopes for Oversized Posters, Artwork, Blueprints - Stay Flat

Protect photos, documents, artwork, and certificates with BOX USA Stay-Flat Rigid Mailers. Built from durable cardboard for added rigidity, these mailers are designed to help keep contents flat and protected during shipping, mailing, storage, and moving. Ideal for home offices, small businesses, studios, and classrooms, they provide a clean, professional presentation and dependable protection for everyday mailing needs.

• STAY-FLAT RIGID PROTECTION: Heavy-duty self sealing rigid mailers made from sturdy cardboard to help keep contents flat and protected in transit—ideal stay flat mailers to protect photos, artwork, certificates, and important documents.
• 18" x 24" SIZE FOR OVERSIZED ITEMS: Oversized cardboard mailer envelopes designed for large prints and paperwork—great photo mailers and document mailer option when you need wide coverage and clean edges.
• BULK 50 PACK VALUE: Stock up for home businesses, offices, and shipping stations—50 count cardboard envelopes for consistent packing, faster fulfillment, and better cost-per-mailer.
• CLEAN, PROFESSIONAL LOOK: Bright white, presentation-ready hard envelopes for mailing that look sharp for clients, classrooms, studios, and official document shipments—easy to label and barcode.
• SHIPPING + STORAGE MULTI-USE: Use as do not bend envelopes, for eCommerce fulfillment, photo & art, certificate mailing, or flat storage—reliable cardboard mailers for shipping, packaging, and organization. Made in USA & made of recycled materials