The other sacrifice is the size or thickness of the bag. A mummy sleeping bag essentially will certainly be much smaller sized for bring around which is why it is a preference for many backpackers/hikers. The rectangular resting bag isn't as small yet because it's not common to be lugging it, apart from somewhere in a vehicle while getting to your intended location, the bulkiness of the bag is not as large a problem.
Requiring time to consider and also select the right resting bag may appear surface to some individuals. If you can fit inside and sleep in it, what else exists to think of? But there is a lot more you need to consider. As I mentioned before, it is the establishing element of whether or not your camping trip is a delightful one.
The last greatest factor to consider in selecting a bag is the insulation that is used in that bag. While both will do the work to maintain you warm, they both have their pros as well as cons. Some kind of extra padding under the bag is very advised.