Document Tube Square(prevent slipping) Documen Poster Tube Expandable Carrying Case 24.3"-40" with Extra Long Shoulder Strap Affordable, Black Plastic Telescoping Document Poster Tube with 3" diameter that expands from 24.3" up to 40" is ideal for artists, architects, and poster collectors Poster tube is Square design to skid resistance,it is made of a very rigid plastic to protect contents from bending or creasing in transit. Tube is also water and light resistant, protects materials against fading from exposure to sun light Storage tube has unlimited uses, such as storage for: posters, blue prints, maps, documents, large photo prints, drawings, artwork, arrows, fishing rods, drum sticks, or whatever else you can imagine Twist off, threaded lid with contact card for easy labeling of tube's contents Includes an Extra Long Shoulder Strap that is comfortable for use even when the tube is fully extended