Now you can use your Blast Zone Inflatable Inside or out! Just fill the heavy-duty sand bags, tie them on the tie down loops, and bounce! Each bag utilizes Hook-and-Loop closure, and holds 40-50lbs of sand. (NOTE: Colors May Vary) This purchase is for Sand Bags only. Inflatable shown for reference. Set of 8. Tie to Anchor Loops on your Inflatable Bag is sealed with Velcro after sand is added Clean Playground Sand Recommended Only Approved method to anchor Inflatables Indoors