Our Tuff Sacks feature the innovative StormStrip&$153; system. A heavy duty 18-oz. body and 34-oz. PVC/polyester bottom combine to create a bag that will last you for years to come. Includes tie-down D-ring on closure, and Additional-heavy-duty buckles. XSmall is great for sunscreen, keys and snacks. Medium or Large bags are ideal for sleeping bags and clothes. X-Long (XL) is the Great size for a Roll-A-Table or tent, and has a side-carry handle for easy transport.