Strong 2.5 mil lightweight unlined brown plastic shipping envelopes. Self seal (peel and seal strip). Biodegradable. Made from 100% recyclable polyolefin plastic. They bear the green earth friendly seal.Water, puncture, tear and tamper resistant.Ideal for clothing or other soft goods not requiring cushioning.Minimize shipping costs with this lightweight, earth friendly packaging choice. USPS, UPS and FedEx approved for domestic and international shipping.Made in the USA