Pop-Up Canopy Compact Weight Bags - Set of 4 Constructed with ultra durable polyester fabric. 17.5 x 5 diameter size Set of 4 weight bags Holds 30+ lbs. of sand each Innovative dual cylinder design wraps around canopy or shelter leg with heavy duty hook and loop fastener strips - tightens down fast Works on hard or soft surfaces Zipper top makes filling and emptying bags quick and easy