Nylon with back pack straps and detachable music folio. Zipper runs full length of the bag so it opens to allow the tuba to be placed inside easily. Most 4/4/ tubas will fit in this bag - examples: All St Petersburg tubas, Miraphone 186, 187, and 188 etc.
The bag fits tubas up to the following dimensions:
Length - 40"
Bell Diameter - 18 1/2"
Width side to side - 19"
Thickness front to back - 14"