Years ago, I made a very simple one, for my DD. It's really just a quilted "sleeve." It has straps, for carrying, which go completely around the bottom and back up (all in one piece, with one one seam for both straps). I was going to put a closure onto it but she saw it, before it was finished, and couldn't wait. Anyway, it's about as simple as can be . . . and took hardly any time, to make.