The Discount Sleeping Bag
Sure, if you car camp or only camp in warm weather, a discount sleeping bag will probably work for you. However, it won't last as long as a higher-quality bag, and if you're caught in sudden cold weather, your comfort could be compromised, too.
Most experts recommend buying a bag that has a little warmer comfort rating than you think you'll need, because there are many factors that can affect a bag's comfort rating, from the type of sleeping pad you use to how much food you eat before you go to sleep.