They are designed to fill and put weight at the bottom of your jump standards to stop them blowing over. They are made from heavy duty PVC stitched around leaving one end with industrial 50mm velcro opening for putting in your choice of fill. They are sold in pairs and empty.

So all you have to do is fill them and start jumping knowing the your jump are secure and won't blow over.

Standard colour is grey but can make in most colours.