About This DURABLE MATERIAL: 1680D Oxford fabric with PVC coating,300% stronger than the most in the market,make the weight bag durable and waterproof. WITHOUT FILLER. Each pack can hold up to a maximum of 37.5 lbs of weight in sand, rock, gravel, snow, dirt and other contents. Three VELCROS: Three velcros sewed on the bag,make the bag attaches the frame closely and firmly QUICK AND EASY SIMPLY FILL: Quick and Easy simply fill the anchors with sand into the large top opening and then simply attach the "hook and loop" straps to the canopy legs. Stabilize any Instant leg Canopy, Pop Up tent, camping sun shlters, sports umbrella with a set of durable universal weight bags. Overview Brand : ABCCANOPY Material : Polypropylene (PP) Style : Modern Product Dimensions : 9"L x 1"W x 21"H Item Weight : 0.45 Kilograms Frame Material : Fabric,Polyester Water Resistance Level : Water Resistant Shape : Square Ultraviolet Light Protection : no Assembly Required : No