Basically, a sleeping bag is an outdoor protective sack designed for people to fit into and get some shuteye. There are certain factors to consider when purchasing a sleeping bag. One is its actual use. Is it to be used only for short sleepovers or long travels? By determining this, one can decide the type of sleeping bag needed and the materials used for a particular purpose. The best materials for an outdoor sleeping bag depends on its use.

Flannel-lined sleeping bags provide warmth and softness. Poly cotton is the most durable and may be best for extreme weather conditions. Nylon is a highly breathable, waterproof and fast-dry fabric. Another factor to consider is how the sleeping bag will keep you warm. The stitches should be tight. The larger the spaces between the stitches, the weaker it is. People planning to buy outdoor sleeping bags should also make sure that the zippers can withstand rough or extreme conditions. Broken zippers make your sleeping bag useless in cold weather; they defeat the main purpose of the sleeping bag, which is to protect.

When traveling, especially when backpacking, make sure that your sleeping bags are malleable or easy to fold for easy storage. Such sleeping bags are not so bulky when packed, which means they can easily be stuffed inside a knapsack. The basic types of sleeping bags are the rectangular type, which rolls up to almost the equivalent size of a small car, and provides lots of leg room; barrel, a slightly oval shaped sleeping bag which is designed to provide more body warmth; and the mummy, which is designed for cold weather use, has a design that tapers towards the feet and has a close fit for trapping body heat.