OEX - Leviathan EV 900

I currently use the oex leviathan 900 as my 4 season bag. It's substantially more expensive than the berghaus transition, but in the world of down sleeping bags it's pretty cheap. Packs down super small and it very warm

I've done several distinctly sub-zero camps in mine- under a tarp and in a hammock, and always paired with a R3.8 mat. Primaloft jacket, trousers & booties too. Cosy every time. The baffles and cinch cords make a massive difference to heat retention. Lofts quickly and fully even after several hours of compression. Always stored uncompressed though. Does lose feathers here and there as pointed out by others. Picked it up in a GoOutdoors sale for somewhere around £120-140 I think, and at that price it's a bargain.

I've slept in mine down to about 0 degrees and I think it could go colder if you're careful to do up all the baffles and flaps to properly trap the warm air. -6 is probably as low as I would want to go with it, and I'm a fairly warm sleeper.

Oex leviathan 900 is a decent cheap bag, i used mine for a while it is a decent bag especially for the price, go outdoors sells em for £120 at the moment , then i got a rab mythic 600 for £350 barley used on eBay, apart from weight and pack size it’s just as functional does the same job of keeping me warm as the more expensive bag. Don’t be afraid of buying used stuff on eBay is my advice or if you wanna buy new the oex leviathan ev 900 are great budget sleeping bags just check all the baffles are filled with down, first one got i had to exchange cause it was missing down in the foot box.

I had the mountain warehouse bag you are talking about and for the money it is brilliant. I have used it to just below freezing and was fine. I changed it because of the weight and even more so the bulk but for the money to get you going I’ve never found better. My wife bought an OEX synthetic bag claiming almost identical comfort rating but nearly half the weight and pack size. I was skeptical but overruled. At about 5 degrees she was really cold so I bought her an OEX leviathan down bag. It is about 4 times the price of her synthetic but she was warm at -4. Hope this is of some help. Please ask if there is anything else I can tell you.

OP, do not underestimate the rate at which this bag sheds down, it's actually quite ridiculous. I've had the bag down to -5ish and it was fine, though I was fully clothed and had a liner.. and still resorted to putting hand warmers in my socks. If I knew about the shedding though I wouldn't have bought it and just spent a bit more for something better quality.