KoiMaster Heavy Duty Live Koi Transport Bags are specialized polyethylene bags used for transporting koi and other fish safely and securely. Fish transport bags are designed to provide a secure and stable environment that helps to reduce stress on the fish. These 4 mil polyethylene bags are made with Metallocene resin that can withstand the rigors of transport, protecting the fish from damage or injury. They are also easy to use and can be filled with water and oxygen to provide optimal conditions for the fish.