Rectangular sleeping bags are the initial and also most typical form you'll see on the market. I directly don't think there is much of a visible difference in between the fillings nonetheless synthetic fibers will certainly not soak up water and will certainly keep you warmer also if the bag is a little bit wet. A damp down resting bag is very hard to dry out as well as is taken into consideration even worse than having no sleeping bag at all.
Remember that with time, from typical use, a treking sleeping bag will certainly lose its warming performance. This results from the fill obtaining a bit much more compressed. This will cause the "air pockets" to go away.
Tapered resting bags grow narrower towards the feet, providing you with a close fit. The closeness of these bags produce more warmth inside whilst resting, nevertheless, the lack of free space limits motion and also might not suit many individuals. They are additionally smaller sized compared to rectangular ones as well as can be rolled up extra compactly, making them much easier to bring whilst on treking journeys.