Fits one alto saxophone and one soprano saxophone.
The original specification for ballistic nylon was an 18-ounce nylon fabric made from 1,050 denier high tenacity nylon yarn in a 2x2 basket weave. Today the term is often used to refer to any nylon fabric that is made with a "ballistic weave", typically a 2x2 or 2x3 basket weave. It can be woven from nylon yarns of various denier such as 840 denier and 1,680 denier. Denier refers to the weight, not the strength, of the fabric.