The slide container built into this Altieri bass trombone bag makes this gig bag totally unique. A box of rigid plastic foam surrounds the delicate slide, protecting it from all angles. This closed-cell foam is resilient, lightweight, and moisture resistant. The interior of the slide box is lined with quilted rip stop nylon, soft yet durable. Custom-sized boxes insure minimum slide movement and maximum lightweight support. 2 layers of foam and quilt pad the bell rim. The trombone bag also has a large zipper compartment on the outside that holds all your accessories as well as backpack straps for carrying convenience.