Self sealing mailers bags are quite useful for soft items, Suitable for transportation such as clothing, t-shirts, blankets, socks, scarves…… 10 Pieces Self-Sealing Poly Mailing Bags. Useful Size: 15.7 X 20 Inch Self sealing mailers bags are quite useful for soft items, Suitable for transportation such as clothing, t-shirts, blankets, socks, scarves……