Great Link from JohnK, better than I had
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Other things to know: A sleeping bag is a nylon bag within a bag. The inside material may be a man-made fiber such as "Hollofil" or "Quallofil" or a natural material such as down.
Although down is lighter and warmer when dry, it looses much of its insulating properties when it gets wet.
A good quality sleeping bag has a nylon or rip-stop outer shell and some a nylon inner liner.
Stay away from bags with pictures on the inside.
Mummy shaped bags have more warmth with less volume, while rectangular shaped bags are roomier for tossing/turning :thumbsup:
Unlesss you hike, weight is not a concern, if you hike weight matters.
Like I once said in another post "What is so sad is 14 oz of the bag is down fill...I told the boys to stay away from that kind of $$$ till they get rich, then remember the old ASM who showed them the outdoors," (see lightweight backpacking)
While looking, look at some of the new sleeping pads if yours is old, they are great for old (or even young)backs