The 1680 Ballistic exterior is extremely rugged and water resistant. Each bag features 2 exterior pockets, backpack straps, shoulder strap, oversized zippers, padded handle, and lined with soft velvoa. For added protection, deluxe bags are reinforced in the bell and valve areas. Fits 18-inch bell tubas (20" W x 46" L x 18.5" D) or 22-inch bell tubas (25" W x 46" L x 22.5" D).