【Durable Materials】The weight bags feature high quality 600D fabric coating with PVC, double stitched seams, guaranteed tear resistance and durability, long service life for years to come. 【Load Capacity】Each sandbag can hold up to about 25 pounds on sand, rocks or dirt and other surfaces, so you don't have to worry about your tent being blown away by wind or other elements. 【Set of 4 Ballast Bags】Stabilize each sand ballast bag's size is 15 x 13.4 inches, suitable for pop-up awning structures or folding gazebos or patio furniture with a set of heavy-duty universal weight bags. 【Sand NOT Included: You can fill it with sand, rocks or a sealed water bottle or water bag. Please note that sand is NOT included, ONLY bags.