Rectangular sleeping bags are the original and most common shape you'll see on the market. These are simple but effective designs and continue to dominate the market for recreational camping and slumber parties alike. While originally being just two blankets zipped together, over the years the technology has allowed manufacturers t fill them with synthetic material creating better heat retention than the old styles. Some are filled with synthetic fiber, wool, cotton or down however if you're allergic to down, this may not be an option for you. There are many debated as to which one keeps you warmer and it really just a matter of opinion. I personally don't think there is much of a noticeable difference between the fillings however synthetic fibers will not absorb water and will keep you warmer even if the bag is a bit wet. A wet down sleeping bag is very hard to dry out and is considered worse than having no sleeping bag at all. In cases where you're in a survival situation synthetic is definitely the choice you should go with. Wool tends to stay dry however it is much heavier and is harder to transport because of that extra weight. Synthetic will keep you warm however it tends to compress easier and the bottom of the bag will let cool air in because of this. Hanging them and changing the position when storing is the preferred method of many outdoor enthusiasts as this keeps them from forming dead spots where the fibers have been crushed and rendering them ineffective at keeping you warm on cold evenings.
Because of the cuts of the two bags and the room they offer you may find that you're on your back sleeping in the mummy bag while the rectangular bag will let you sleep on your side, stomach or back. And depending on how large the rectangular bag is you can shift your body into even the most unique but standard for you sleeping positions in order to get a comfortable night's rest.
It is important to remember though that the temperature ratings are guides for reference only. Because, just like spicy food, eating a jalapeno pepper for some isn't a big deal...but for others eating one would feel like it would burn the skin right off their tongue. The same goes for a sleeping bag. A +20 degree rating would mean that for most the bag would be warm enough. The best way to pick a warm enough bag is to go with one that handles a 10 degree colder weather than what you're anticipating to be sleeping in. Choosing in that manner should have you...covered. (No pun intended.) And again of course, appropriate sleep wear should accommodate the colder or warmer needs you may have.
Sleeping Bag Friday , March 16th , 2018 - 20:38:19 PM
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