Supply Air Supply Air 12.5x9.5 White Rigid Stay

50-pack of rigid stay-flat cardboard envelope mailers measuring 12.5 inches wide by 9.5 inches long interior usable space. Each mailer is constructed from 250 GSM (grams per square meter) white cardboard stock. The rigid construction measures 0.03 inches thick per mailer. Self-sealing adhesive strip closure process: remove protective liner from adhesive strip along flap edge, fold flap over opening, press firmly along seal line to activate adhesive bond. The mailer accommodates flat items measuring up to 12.5 x 9.5 inches including documents, photographs, art prints, certificates, thin rigid products, and flat media. White exterior finish provides uniform surface for address labels and shipping information. Each mailer weighs approximately 0.14 pounds. The 50-pack total weight is approximately 7 pounds. Interior dimensions verified at 12.5 x 9.5 inches. Exterior dimensions measure approximately 13 x 10 inches. Cardboard thickness prevents bending and folding during transit. Adhesive closure eliminates requirement for tape or additional sealing materials. Pack contains 50 individual mailers. Manufactured in the United States.50-pack of rigid stay-flat cardboard envelope mailers measuring 12.5 inches wide by 9.5 inches long interior usable space. Each mailer is constructed from 250 GSM white cardboard stock with rigid stay-flat design measuring 0.03 inches thick. Accommodates flat items up to 12.5 x 9.5 inches including documents, photographs, art prints, certificates, and thin rigid productsInterior usable area measures 12.5 inches wide by 9.5 inches long; exterior dimensions measure approximately 13 inches wide by 10 inches long; each mailer measures 0.03 inches thick when laid flatConstructed from 250 GSM (grams per square meter) white cardboard stock; cardboard thickness prevents bending and folding during transit; white exterior finish provides uniform surface for address labels and shipping informationSelf-sealing adhesive strip along flap edge; closing process requires removing protective liner from adhesive strip, folding flap over opening, and pressing firmly along seal line to activate adhesive bond; eliminates requirement for tape or additional sealing materialsEach mailer weighs approximately 0.14 pounds; 50-pack total weight approximately 7 pounds