Everybody should have one!
Amazing design. One minute it's a rolled up piece of plastic and then the next it's a sledge!
It's light and easy to add to a backpack. Simple to use and even has handles to hold on to when skidding down a snow bank at a top speed (oh it flys).
Only bad thing is that the handles give you no steering ability, but then again not many sledges do.
Go and buy one and be a kid again.