Zippy Sack Star Wars Twin Size Don't make your bed, just zip it up instead. Kids will never have to make a bed again. Just zip and flip and the bed is made. Making your bed is now fun and easy. No more struggling to fit covers between the bed and the wall. And plus, it fits snug over your mattress and works great on bunk beds. ZippySack is made of super soft and cuddly fleece material that is warm enough for cold nights, but not too thick for warmer nights. It works for all seasons. Features fan favorite Darth Vader and Storm Troopers Official Lucas licensed product.