These anodized aluminum mailing and storage tubes give a first impression of rugged durability and professional pride. Carefully designed to protect anything that can be rolled, including charts, maps, blueprints, and posters. The tubes are 37" long, moisture-proof, and have adjustable shoulder straps. One end cap is sealed closed and the other removable. Perfect for students, pilots, contractors, draftsmen, architects, engineers, sportsmen, campers and boaters. Unique triangular shape of ATT37 makes for easy document retrieval and can hold up to 3" diameter inside.