These bags are very well made. They have a different material located on the bottom for extra thickness and support. I orders 2 sets and got 1 blue set and 1 red set. Both sets have great color to them and go great with my bouncers. The only complaint would be the tying material used to attach to the bounce. It feels like very thin plastic material that looks a little cheap. It would have been nice to have a D ring attachment so you didn't have to actually tie it to keep it secure to the bouncer. Over all the bag itself is made well and can hold quite a bit of sand.