Blast Zone Sandbags for Inflatables Blast Zone Sandbags for Inflatables firmly anchors. The multi-colored heavy-duty sandbags hold up to 50 lbs. sand and can be used both inside and outside the inflatable. The sandbags come with a hook-and-loop closure. Why You"ll Love It: Just tie them the tie down loops and get ready for some bouncing. Age: 3 to 10 years FeaturesMade of heavy duty materialCan be used indoorsHolds up to 50 lbs. eachHook-and-loop closureEasy to fillEasily anchors bouncer