Your sleeping bag is important, because if you do not get a good night sleep, due to being uncomfortable and cold in your sleeping bag, you will be tired and not have as much fun on your hiking trip as you should.
Temperature Rating - When a bag is referred to as a 20 degree bag, it means that it will protect most people from weather that drops no lower than 20 degrees and keep you warm and comfortable.
Filling - Synthetic sleeping bags are easy to care for and does not retain water. Down sleeping bags are warmer and more comfortable, they also take less space. Just make sure the material is waterproof as it will get wet easily if you sleep outside.
Shape - The mummy sleeping bag helps to reduce the loss of body heat, because of it's form fitted shape. They are also smaller and lighter to pack and easier to store.
The rectangle sleeping bags can be unzipped completey to serve as a comforter
or blanket. Two bags can also be zippered together to form a double
sleeping bag.