DEWEL Expandable Storage Tube is made of durable and sturdy plastic, which is waterproof and light-resistant. The telescoping carrying case could expand from 17.5" up to 29.5" with adjustable interlock, and it has adjustable shoulder strap allowing for easy mobility and transportation. The Plastic Tube could be used for storing/ moving/ transporting/ travelling/ carrying art works/ documents/ posters and so on. The screw on end cap makes storing and removing documents very simple. The removable cap allows you to store your contact information or tube storage details for easy identification.