If you see a +20 degree score that would certainly indicate that the bag should be cozy enough for temperatures that are 20 levels or warmer.. And if you see a - 20 level score then it has actually been figured out that the bag needs to be cozy sufficient for minus 20 degree climate.
Rectangle-shaped: These are specifically like the term recommends. A big rectangular shape. As a result of their form, they tend to be the least functional style of sleeping bag. There is a bargain of room within the bag for the body to warm up. Because of their heavy weight, they might be far much better matched for a "Automobile Camping" journey instead of a backpacking tour. They do have the benefit of a set of bags being able to be zipped collectively as well as come to be a resting bag for a couple rather than one person. With this style, a full or queen blow-up mattress beneath truly contributes to a pleasurable evening's sleep. (Once more not advised for the back country).
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.