When you are camping or going on a trek or hike, it is important to answer the above questions. On these depend upon what can be recommended for you.

And yes, you have a large choice. There is one for very cold weather, cold weather, hot weather, humid weather, rainy weather, midly hot and mildly cold weather etc.

You would therefore need to buy a sleeping bag which would keep you very warm in the very cold weather with all kinds of linings to ensure that your body temperature is maintained; if it is not cold, but warm, then your sleeping bag needs to be airy so that you don't sweat inside; if it is hot, then the construction of the sleeping bag is such that it must let in fresh air, so as to prevent from sweating. Much the same case with humid weather. If it is rainy weather, you bag has to be such as would prevent rain water soaking your bag, and also keep you dry.

If you are the occasional trekker and generally stick to general temperature areas, then the obvious choice would be a sleeping bag, which allows you to breathe. It has vents at the bottom of your feet, and is not as close fitting as the 'colder' weather is.

Whichever bag you buy, make sure you buy a good quality one. A little more expense today will save you dollars tomorrow! Buy one that allows you to use soft detergents after use, and dry them off as soon as you return. Good care of a sleeping bag would help you save more in the long run.

You can make out the sleeping bag you if you look at it closely. A very close fitting bag is a total reject. Sleeping bags, rectangular in size offer great comfort, and two of them can be fitted together rather quickly.

As stated earlier choose one that meets your needs today, and if possible, on another day!