Sleeping Bags

If you want to stay warm on a cold night then you might want to pick the right sleeping bag. A sleeping bag is one of those places where you can either waste money are not spend enough if you do not know what you are looking for. There are three major characteristics of sleeping bags: temperature rating, insulation material and shape.

Temperature ratings are made so you can tell what the warmth of the bag is. The rating basically tells what the comfort range of the bag is. If the rating is 20 degrees (Fahrenheit), then you should be comfortable from about 20-40 degrees. But there is one major problem, sleeping bag companies have not set universal guidelines for ratings. Each company places the rating which they feel is correct for their bag. So this causes a little problem for comparing bags. For general 3 season backpacking, a 20 degree bag is the best place to start. This will keep you warm on cold days, but you won’t burn up on hot summer nights.

Now that you know how warm a bag is, don’t you want to know what makes it warm? There are two major materials, down and synthetics. Down is what has been used since sleeping bags were made. This is probably the warmest material for it’s weight and it compacts very nicely in a stuff sack. But if you ever get down wet, be warned, it loses all it’s warmth. This is where synthetics come in. These new materials are almost as warm as down and compact almost as much as down. The great thing about synthetics though is that if it gets wet, then it will still be warm.

As people strive for lighter weight equipment, down bags look very attractive to many backpackers. The outer materials on most down bags are now very water repellent. So the old fear of getting your bag wet is slowing being discounted. The key factor to down bags is fill weight. This will usually be a number from 600 - 900. The technical definition of fill weight is the volume 1 ounce of down will displace. So that means that 1 ounce of 600 fill down will displace 600 cubic inches in a standardized test. In other words, the higher number of fill power means more loft. For the same amount of down, a 900 fill bag will be warmer and lighter than a 600 fill bag. But, a 900 fill bag will also be more expensive for this very reason.

Shape makes a big difference in sleeping bags. The two shapes, mummy and rectangular each have their own good parts. If you are going to go backpacking, then by all means buy a mummy bag. It is called a mummy bag because it is more form fitting and looks like a wrapped mummy. This close shape keeps you warmer since there is less air to warm up inside the bag. Rectangular bags are usually big, bulky and heavy. They are not as warm as mummies since they are not form fitting.

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