EXTRA LARGE Sand Bag: Designed with a large size 16" * 12", extra capacity to hold more sand to keep your boat cover stable and upright. Its large size and extra capacity help reduce the need for multiple sandbags, thus reducing waste and preserving the environment THICKENED 600D Marine: The extra-thick 600D Marine Grade Polyester Canvas construction ensures that the sand bag can support weights of over 20 pounds, providing you with a stable and reliable solution. This feature ensures that your sand bag stays in place, even in rough waters DOUBLE-STRAP Design: This scientific design evenly distributes weight, preventing stress points and ensuring long-lasting durability. When the weight of the sandbag is distributed evenly across the body, it prevents any strain or stress on specific points and reducing the risk of breakage 304 Carabiner: Equipped with a 304 stainless steel carabiner, allowing you to quickly secure the two attached straps for effortless use Multiple Application: It can be used as a fender for your boat, a weight for your anchor, or a sandbag for construction projects. Its large size and extra capacity make it an excellent choice for any situation that requires transporting or storing sand. An invaluable addition to any boat owner's inventory