The significant difference between both styles is the cut and also form of the bags. The mummy bag is extra restricting. You can think about it like your own individual cocoon where you can go to bed in the evening as a caterpillar as well as wake up the next early morning as a butterfly. You're completed tight with not a lot of area to relocate. The rectangle-shaped bed on the other hand gets its name from its rectangle-shaped form as well as lets you relocate your legs.
Think about the time of year you will certainly be going and also whether or not the nights will certainly be chilly when you're heading off outdoor camping. Take into consideration whether you really feel warm or cold when you sleep. If you feel the cool, you might want to think of a camping mat to sleep on which will certainly protect you from the chilly night ground and also supply you with added warmth. It's much easier to unzip a sleeping bag and cool off if you are feeling warm, than it is to get rid of the cold.
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.