24x24 Large White Postal Poly Shipping Bags - Envelope Mailer with Self Adhesive, Waterproof, and Tear-Proof. EcoQuality 24x24 white poly shipping bags are self-sealing for easy packing with a tamper-evident, super secure closure. Pressure sensitive adhesive provides a high strength, durable closure that is water and dirt resistant. Highlights: Wide variety of uses: our 24 x 24 poly mailer bags are very useful for soft item(s) such as blankets, t-shirts, scarves and other nonbreakable items. Save money & shipping costs: our poly bags are of a great thickness for shipping all sorts of goods. They are light enough to save money on shipping. No need to lick, comes with a self adhesive tape all bags are made of strong plastic Waterproof: the plastic mailing is thin, durable, and quite flexible, so they're very forgiving of weirdly-shaped contents, and it's easy to add in a bit of padding, like newspaper or bubble wrap, for extra protection.