The Coolpkg 100 #7 14.25×20 Poly Bubble Mailers are padded envelopes designed for shipping and mailing purposes. These self-sealing envelopes are made of waterproof poly material, ensuring the safety of your items during transit. With an interior size of 14.25×19″ and exterior size of 14.25×20″, these envelopes are suitable for various mailing needs. Made in the United States and 100% recyclable, these mailers are a practical and eco-friendly option for sending packages.