Kelty - Cosmic Synthetic 20

I love my Kelty Cosmic Synthetic 20F

For casual three-season camping around 0°C, synthetic’s way easier on the wallet. Marmot Trestles or Kelty Cosmic Down alternative bags hold up fine, and you don’t freak out about melting water or sweat ruining insulation.

I second the Kelty Cosmic 20. Great lightweight down bag for the price!! I’m from SLC and camp/backpack in the Uintas constantly and it has never let me down and always been warm enough (even in a hammock)

Holy bageebus that's a 3lb sleeping bag. That is ludicrously heavy. Even the Kelty Cosmic 20 at $169 is 2lb 3oz. But beware the temperature ratings -- you want that 20F (+/-5F) to be closer to the "comfort" rating while the Kelty is rated at 20F but in fact has a "Lower Limit" of 21F. Get a down bag if you can. You don't need synthetic in the Sierra in summer. If I'm staying below about 10000' in elevation and it's July or August and the weather all looks very warm I *have* used a 30F but in general I use a 20F all summer long.

Kelty Cosmic 20 is the typical response for budget, good and light enough for most. Marmot Trestles Elite Eco 20° Sleeping Bag is a synthetic bag that's very similar in size, weight and warmth to the Kelty but might be cheaper depending on where you're located.

honestly dude, been there with the whole xl + lightweight + budget thing. from running my shop, ive seen tons of folks struggle with this exact combo you know. few solid options that wont break the bank - kelty cosmic down 20 comes in long/wide and packs down decent for the price. rei co-op trail pod 29 is another good bet, little heavier but super roomy and usually on sale. for 3 miles in nj temps, id lean toward the 30-degree range unless youre camping late fall. learned the hard way that going too warm just means ya carry extra weight for nothing lol. honestly the quilts someone mentioned are great too if youre open to trying something different. enlightened equipment makes tall/wide options and theyre game changers for bigger folks who move around at night.

I've gone the last three years in mid September. It's my favorite time of year to go. I bring the Kelty Cosmic 20 down sleeping bag with the Klymit static V sleeping pad. The Kelty occasionally drops down to 125$ and it's perfect for that time of year. Warm days and slightly chilly nights. I think a bag rated 25-30 would be fine

I'd look at the [Kelty Cosmic 20](https://www.rei.com/product/231267/kelty-cosmic-20-sleeping-bag-mens?sku=2312670002&store=102&CAWELAID=120217890018009653&CAGPSPN=pla&CAAGID=147758259799&CATCI=aud-830183485327:pla-2021410583250&cm_mmc=PLA_Google%7C21700000001700551_2312670002%7C2021410583250%7CBA%7C71700000074421743&gad_source=1&gclid=Cj0KCQjw7dm-BhCoARIsALFk4v-rxEXOce1pDojIDEZWkM93aGHIX8ftGRu5cd42LJb4rPbpf-LBnlAaArhqEALw_wcB&gclsrc=aw.ds). A down bag for just $149. Take 20% off and you're looking at $120. Tested comfort on Cosmic is 31 degrees. If you want something slightly warmer, the new [REI Radiant](https://www.rei.com/product/245179/rei-co-op-radiant-20-sleeping-bag) at $199 (just $159 after coupon). This has more fill, and varying sizes to choose from. Tested comfort 25. Weight almost the same, but the REI has better down, and more fill weight. The other option would be to buy a 30 degree bag, and a decent liner. I'm a big fan of liners because they not only help add a little warmth, they help keep the bag clean. There are a handful of Mountain Hardwear Bishop Pass 30 bags currently on outlet. So you could use the 20% outlet coupon there, and the 20% regular coupon on a liner. Just a thought. Pad also means a great deal. A Therm-a-Rest Neoair is going to be considerably warmer than a Z-Lite, especially if the ground is cold underneath you.

I'm 5'9" and about 225lbs. I have a Kelty Cosmic 20 that I'm passing down to my kid because it's not comfortable. It always feels like it's too tight around my chest. I don't know if I lay too low inside the bag or what but It feels like I can barely fit my arms into the bag and be able to zip it up. I checked and it's a regular version and not a short or women's. I'm looking for something with a little more chest room. 3 seasons. I doubt I will ever be in freezing temps. I'm looking at the Nemo Disco 15 because my research showed that it might fit me better than others. I'm not a really big guy but I need to be able to move my arms around without feeling like I'm going to bust the zipper. Any other recommendations?

I'm own a decathlon sleeping bag, Forclaz MT something that has a comfort rating of 10°C and limit of 5°C. Took it to the lakes back in early Sept and slept well. Now I'm looking to buy a Kelty Cosmic 20 and that has a comfort of 0°C and limit at -7°C, and it's £80 on base camp gear website. Not sure how it'll perform but I hope I helped expand your options :)

Heya, just got the Kelty not too long ago, and can say it is not compact at all, but kinda expected since it's synthetic filled instead of down filled. It is comfortable, and did give me good sleep despite the weather being warmer than the comfort rating