Temperature rankings are quite crucial items of details to consider when picking a bag. And although mummy and also rectangle-shaped resting bags can cover a wide range of temperature levels, mummy bags are the common designs for the extreme polar temps such as those you would locate in the Andes.
Rectangle-shaped sleeping bags go as much back as the late 1800's when a mail order catalog pioneer Pryce Pryce-Jones came up with the suggestion to attach 2 rectangular carpets together with ties. He is taken into consideration to be the innovator of today's contemporary rectangular sleeping bag design. After the war he had several of these bags still left as well as made a decision to market them to the public.
An additional kind of sleeping bag is the mommy bag. Unless you are intending a trip to an extremely cold climate and resting outdoors after that you will possibly be happier with rectangular sleeping bags over a mommy style bag. These bags have a certain use as well as they are extremely particular, extremely cool weather condition, mommy sleeping bag.