Mummy and rectangular sleeping bags differ mainly in their shape and function.
Mummy sleeping bags have a tapered form that is wider at the shoulders and narrower at the feet, resembling a mummy’s shape. They are designed to fit closer to the body and provide better insulation. Mummy bags are ideal for colder climates because they retain heat well. They also tend to pack small, making them a great option for backpackers.
Rectangular sleeping bags, on the other hand, have a typical rectangular shape that has the same width from head to toe. They provide plenty of room for your legs and arms to stretch out. Rectangular bags are great for car camping or family camping when weight is not crucial. However, they tend to be heavier than mummy bags and do not pack down small.
Here are some more details about the differences between mummy and rectangular sleeping bags:
Mummy sleeping bags are designed to fit closer to the body and provide better insulation. They have a snug fit and are quite narrow. This means that you won’t have much room to move around in a mummy bag, but you will stay warm throughout the night. Mummy bags also feature hoods that can be cinched down to retain heat. Their fitted shape offers better insulation than other types of sleeping bags and will keep you cozy and snug in the coldest of weather conditions.
Rectangular sleeping bags, on the other hand, provide plenty of room for your legs and arms to stretch out. They are not designed to provide high levels of heat insulation but do offer lots of room to move. A rectangular sleeping bag can also be unzipped and used as a comforter on hot and stuffy nights.
In summary, mummy bags are ideal for colder climates because they retain heat well, while rectangular bags are great for car camping or family camping when weight is not crucial, and you want more room to move.
I hope this helps you understand the difference between mummy and rectangular sleeping bags!