Made from heavy duty polyester fabric, over sized main compartment holds training gear and cloths with mesh design for breathability, expandable mesh compartment for wet post training  cloths for more dry quickly to use as duffle bag, high quality zippers, pocket for phone or sunglasses, side pocket for small things. Size convertible: 69.8cmx40.5cmx22.8cm. Backpack size: 47x25cmx23cm