I’ve always been impressed by its performance, be that on a rainy thru-hike of Germany’s Black Forest National Park, dozens of winter nights in and around Snowdonia’s Glyderau, or 10 chilly October nights in Wyoming’s Grand Teton National Park.

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Whether that’s the case or not, there’s no denying the bag’s credentials - it packs down very small, has a no-stitch construction which means the risk of cold spots is reduced, and the anti-snag webbing on the zipper is a nice touch that we found works well to keep you properly zipped up all night. For the best gauge of a bag, pay close attention to the comfort rating: this is the temperature at which the average person should be able to comfortably sleep without waking for eight hours. You can have the warmest sleeping bag on the market, but if you don’t combine this with a good sleeping pad or camping mattress and a proper shelter, you’ll still struggle to keep warm in the winter. Initially, we were quite worried about this, wondering how long it would take until the bag was void of insulation altogether.It comes in two lengths, regular and long, and the ripstop outer fabric is robust and should last for many chilly seasons.

OEX Leviathan EV 900 Sleeping Bag - Yellow

It relates to the loftiness of the down itself, and generally speaking, the higher the number, the better the quality (with 900 fill power being the best you can get). It boasts a good, shaped hood, which can be pulled tight around your face, and has inner pockets for keeping valuables safe, or phones warm and handy. Hell, just head into the Lake District in mid-January and take a peek into the various tents you spot.The rarely repeated line was first climbed by Rodden in 2008 and for a while was not only the hardest single pitch. For safety reasons, you should steer well away from these, and if you plan on camping at -20°C (-4°F) , it’s important you get a bag with a comfort rating down to that temperature. I don't use sleeping bag liners as it's extra weight to carry all day for a bit of luxury in my opinion.

OEX Leviathan EV 900 Sleeping Bag | Blacks

If you're a mountain-loving wild camper, the temperatures up high during both spring and fall will probably demand more than your average 3-season sleeping bag.When it comes to temperature ratings, this is perhaps the single most important identifier of a true 4-season or winter sleeping bag. If you use the provided stuff sack, you can get it down to the size of a watermelon or a standard football, and weighing just over 1.