JUST THINK TOYS Water Blocks Storage Bag (22059)A twist on classic block sets and ball runs, WaterBlocks stick like magnets to tub walls and tiles when wet! Better yet, they're safe; mildew and bacteria resistant, and pthalate free! With this Mesh Storage Bag, you have a great place to store your blocks out of the bath or pool. The blocks dry easily in the bag, helping to keep them clean and safe. Sometimes the best toys are the simplest toys, toys with lots of open-ended possibilities that encourage young minds to think, to create and to explore. The best of these toys provide progressive layers of challenge for children to discover as they grow. WaterBlocks bring classic block play into a fun, fascinating, new, watery environment.