Although I think it may be overpriced, my kids had a lot of fun with these blocks. It would be great if these could be offered in larger bundles with a discounted price because the more of these you have the more fun it would be. I bought two sets and they were all in good shape. The seams are sturdy and one end has a zipper that is inaccessible unless you use a paper clip or hook toolI guess thats for when you need to refill it with filler material. But I dont see this losing sturdiness for a long time and kids cant open the zipper, it is tucked into a groove pocket. Overall I think its good, I just think prices could be better.