Fusion Premium Series - Euphonium Gig Bag, Black/Blue Jacquard exterior, a hardwearing, water resistant, rip-stop polyester material. Soft non-scratch, non-fibrous quality velvet mix interior. Comfortable, padded backpack straps with integrated flow system plus chest and waist belts Fuse-On systems lets you attach Fusion accessories bags to your instrument bag. The "Fuse-on" bag that will best fit the Euphonium bag is the Laptop (Large) Backpack 30 mm (1.18) high-density foam padding for all round protection Removable rain-cover for additional protection