Made from extremely light and compressible Responsible Down Standard-certified insulation that’s been treated to repel water, this bag has several distinguishing features. Weighing 1,370g (3lb), the Leviathan 900 is also reasonably lightweight, considering the temperatures it is designed for. And while there are bags out there that will deliver an equivalent level of warmth at a fraction of the weight, there’s simply no beating it at this price point. Mummy sleeping bags are also more lightweight. Additionally, you can also find double sleeping bags in various shapes to accommodate more than one sleeper.

One option I was considering was getting an Alpkit Skyehigh 900 + Hunka XL + Thermarest NeoAir Xtreme + Alpkit Masson sleeping bag liner, would this work? It might seem overkill but I don't want to get cold or wet. Small: 10.6in x 6.7in / 27cm x 17cm; Medium: 10.6in x 6.7in / 27cm x 17cm; Large: 10.6in x 6.7in / 27cm x 17cmSnugpak’s polyester Softie insulation has been a mainstay in the British brand’s products for over thirty years. It utilizes superfine yarns bound together with special resins to mimic the properties of natural insulation such as down. The result is a really plush feeling bag that is easily warm enough for winter camping trips.

When shopping for a sleeping bag, you should seek additional features that will enhance its utility. Some of the popular features include; OEX list this bag as having a comfort temperature of -9 degrees Celsius, a lower limit of -16 and an extreme rating of -39. They tested the bag according to EN13537 (which is an industry standard means of testing how warm sleeping bags are), and having used the bag for over three years, we definitely have some thoughts on these numbers (which we cover below). The Kelty Cosmic Down 20’s is unusual in that it uses trapezoid-shaped baffles to provide insulation. The dog approves (Image credit: Kelty) Insulation This bag is a gloriously cozy cocoon to nestle within and, with a comfort limit of -15°C (5°F), it is wonderfully toasty in all but the most Baltic conditions. However, it's limited to sub-zero use, as its elasticated expander panel allows the user to open things up, thus regulating the temperature inside.

Down sleeping bags are warmer than synthetic ones. Additionally, the down insulation filling is lighter and more compact, allowing you to compress them into a smaller size for storage. Despite that, these sleeping bags are preferable for dry weather since they clump and lose their insulating qualities when wet. The Exped Waterbloc Pro sleeping bag is a 4-season sleeping bag designed with bivying in mind. It has 800 fill down, making it very soft and warm, with a Pertex outer shell that repels the weather. On the other hand, a two-season sleeping bag is perfect for the late spring to early fall months, providing warmth up to 5 degrees Celsius. During the late fall or mild winter evenings, the three-season sleeping bag can withstand temperatures as low as 0 degrees Celsius. Finally, the four-season sleeping bag provides protection in temperatures as low as -5 degrees Celsius on chilly winter evenings.