Unless you live in a place where it gets really cold at night, a sleeping bag like this might be overkill but there are plenty of us out there who are dealing with freezing temps half the year so this might be a must-have item for you. The Travelpak 4 walks the line between affordable and having a low temp rating while still packing down to a reasonable size. Oddly enough it has a built-in mosquito screen, so if you are using this bag outside during warmer periods then that's a bonus.