Alvin ALTUBE Expandable Tube - 3 4" I.D This tube is ideal for the storage, protection, and transport of documents, artwork, prints, posters, and more. Features a clear plastic cover with replaceable document identification pad inside. Expands from 26 inches to 43 3/8 inches in 24 locking 3/4 inches increments with a 3 3/4 inches inside diameter. Tube includes adjustable 42 inches shoulder strap. Size: 3 3/4 inches