The 15PCS #3 Poly Bubble Mailers by gooddeal are padded envelopes made of waterproof polyethylene material, featuring a bubble-lined interior size of 8.5″ x 13.5″. These mailing bags are designed in a classic envelope shape with an exterior size of 9.5” x 13.5” and are manufactured in the United States. Ideal for shipping and mailing, these poly bubble mailers provide reliable protection for your items while ensuring they stay dry during transit.