The Kelty Cosmic Down 0 is the heaviest, least weather resistant bag in our review, but it is also the least expensive. At $220, you get a bag that still fulfills the primary job of a cold weather sleeping bag: to keep you warm. Despite the low price, the Cosmic Down still has great features like a draft collar and full-length draft tube to shield you from winter winds. While not the most comfortable bag we tested, there is still ample room for side sleepers. If you're looking to do some cold weather car camping or short overnights without going for broke, this contender is a good option. For $110 more, you can get the Best Buy award winning Rab Ascent 900, which is lighter, way more weather resistant, and just as warm.
The Kelty Cosmic Down 20 is also a Best Buy Award winner, this time for backpacking sleeping bags. For the impressive price tag of $160, Kelty gets the job done with a reasonably warm, decently comfortable, and semi-lightweight sleeping bag. If you're looking for an affordable all-arounder but don't need the warmth of the Cosmic 0, the Cosmic 20 might be the perfect match/