Tube expands from 26" to 43 3/8" in twenty four locking ¾" increments. 3¾" inside diameter, tube includes adjustable shoulder strap with 52" maximum extension. Located under the clear plastic cover, replaceable document identification pad may be used to identify tube contents. May be replaced with a 5¼" paper circle when contents change. For the storage, protection and transport of documents, artwork, prints and posters.