Actually they’re called document storage tubes, but what’s in a name.
Necessity drove me to discover these adjustable wonders.
I needed a safe place to store some unwieldy satellite dish parts. Mmmmmm . . . what to do?
A Google search of “plastic storage tube” yielded several different sizes — both length & diameter — of adjustable tubes.
And my large tube (7-inch diameter) fit the bill for unwieldy satellite parts storage . . .