The lifeventure tritan flask has a lightweight yet ultra durable single walled construction made from tough tritan copolyester which does not retain flavours from previous drinks the screw on plastic lid has a retaining loop that allows you to attach it to a buckle or backpack the tranluscent finish features measuring markers features tritan copolyester lightweight durable odourless and tasteless high impact resistance tough single walled construction screw on plastic lid with reta