DURABLE: Kitchpack poly bags are tear proof, waterproof, and puncture resistant. These solid poly mailer bags are made with reinforced sealing on the sides and edges, which are long-lasting compared to other mailers. Our poly mailing bags will keep your packages safe and secure until they reach their destination. STRONG SELF SEALING: Our poly mailer envelopes use a strong self-sealing adhesive strip, which can maintain strong stickiness. Just simply fold over to seal your packages safely and securely. CONVENIENT: These poly shipping bags are lightweight and durable, which will help save on shipping costs. It is ideal for items such as t-shirt, jewelry, makeup supplies, photos, magazine, books, clothing, and many more. ENSURE PRIVACY: The white outer surface and black inner lining give opacity and prevents prying eyes with these poly mailers. SAVE ON SHIPPING: Kitchpack poly mailers bags are 2.0 mil thickness for shipping a wide variety of non-fragile items. These mailing envelopes saves you money on your shipping costs with its light weight.