It is made of PVC. Keep your dry bag with kayaking, boating, fishing, the pool, or on the beach. Comes with an extra long removable and adjustable shoulder sling for easy carry and transport. You can sling the strap over your shoulder,Or attach the strap to your boat or kayak to keep your bag conveniently at hand. 5L, 10L, 15L, 25L, 30L are also available. Price below is for 10L.