Our Storage/Toy Boxes are constructed the same as our Pool Blanket Boxes, we use a fully welded internal frame that can be made to any shape or size. We can place wheels on them for easy movability, we can place floors inside them if required. Lids have gas struts to lift and hold the lid open. In some cases, we can add a Storage Box to a Pool Blanket Box at one end or both, and even a full-length box behind the main Pool Blanket Box. They are also strong and sturdy enough to use as seating.