4pcs-pack Weight Bag helps to stabilize any type of Canopy or Tent and each bag holds up 25-30 lbs. Made with 210D heavy duty Oxford material and 100% waterproof PVC coating, very sturdy and durable. Perfect size and double pockets design provide a perfect weighted base for your Canopy. Use Velcro seals instead of zippers, easy to use and no need to worry the zipper will broken. Please Note*SAND NOT INCLUDE*