Thank you for viewing! (*´`*) 13 Cushion Envelopes, Long Size, for Packaging Outer Dimensions: 27 x 13 CM With cushioning material, air cap Cushion bags, packaging materials, for shipping small items, etc. Waterproof shipping envelopes for Yu-Packet, DM-mail, Click Post, and Pos-packet. Convenient for shipping trading cards, accessories, and other precious collectibles. [Color]: White, plain. [Material]: The surface is not paper, but cushioning PE polyethylene, so it is difficult to tear and the contents will not get wet in the rain. The inside has a cushioning air cap, which can cushion external impact. It is durable and safe as a shipping envelope. [Features]: With cushioning material (3 layers), and the flap has a strong adhesive seal, increasing the efficiency of packaging work. [Essentials for mail-order shipping from various companies]: Compatible with all sizes of Japan Post, Yamato Transport, Sagawa Express, etc., including DM-mail, Nekopos, Yu-Packet, Click Post, and Yu-mail. We are looking forward to purchases from those who understand overseas products. Long size No. 3, Long 3