Review on KEEPTOP Weighted Blanket Removable Cover by Barbara Lawler

In principle a good product, but there is a design problem that I haven't noticed until tonight. My son is a very busy and curious boy and I heard something knocking down the stairs. He took the blankets off the ceiling, climbed in, zipped it up and couldn't get out. Now I know that's very stupid, but he's a very inquisitive 7-year-old boy and I'm wondering if other kids have done this? It was really scary and he was very hot and sweaty and had to go downstairs from his bedroom to the living room to get us to open. It was pretty scary.