I'll agree that these sleeping systems are worth their weight in gold! I used one while in the service and I bought one for myself as soon as I got out.
They pack up the size of a basketball, or you can use the black bag with tightening straps to configure it any way you'd like. Some guys like to make a log out of their sleeping gear and others like to make a ball. In any event, if you're thinking about it, just get one!