There are just times where your regular old sleeping bag will fail you. Outside offers advice in their
Gear Guy column on the best overbag to
dress up your sleeping bag with in the winter. The Gear Guy answers a question on extending a ten degree bag in the
winter months by offering up suggestions on four overbags. His overall favorite seems to be the the
Cross Mountain. Whatever you do, he suggests, it seems to make
more sense to invest in an overbag to avoid the costs of buying a whole new sleeping bag.