Sea to Summit Big River Dry Bag nylon Non-PVC mid-weight dry bag has space saving low profile Hypalon lash loops TPU laminated fabric with 10,000 mm waterhead Super strong and abrasion resistant 420 D nylon fabric Waterproof, double stitched, reinforced, tape sealed seams Hypalon lash loops for secure attachment or stacking TPU laminated fabric with 10,000 mmhydrostatic head Super strong and abrasion resistant 420D Nylon fabric Waterproof, double stitched, reinforced, tape sealed seams Durable lash loops for secure attachment or stacking Waterproof hypalon roll-top closure does not wick moisture Oval base resists rolling - stays where you put it Features the patent-pending Field Repair Buckle with stainless steel pins As of 2018: Features the patent-pending 3/4in | 20mm Field Repair Buckle with stainless steel pins