Sea to Summit Spark SPII Ultra-Dry Down Sleeping Bag (35F/2C)

I used this bag a few weeks ago for a four day trip in Yosemite. Before going, checked all the weather forecasts and none had nighttime lows dropping below the low 40s, high 30s. On the FIRST day we experienced rain, hail, sleet, and snow--over the course of the four days, nighttime lows hit the single digits. While I was by no means toasty at night (obviously that's not what the bag is designed for, completely my fault) I was warm enough to get a decent night's rest--which is a lot more than I could have asked for otherwise. I'm sure that if I'd packed a liner, or termals, I would have been downright warm. On other trips with less drastic lows (think low 40s), the bag has been great.Sea to Summit gives you everything you need for a trip out with the excellent compression sack, and everything you need to store it at home in the bigger storage sack. It's definitely pricey, but if you're looking to lighten your load (and, unfortunately your wallet), you son't be going wrong choosing this.

I bought this bag for a trip to the enchantments in Wenatchee NF. On the first night, I broke the zipper, and had to deal with an opened bag with cold temps in the mid 20’s through the rest of the trip. The zipper is not designed to be separated. Once it detaches from the track, it cannot easily be reattached without serious modification to the bag. I had to resort to safety pinning the bag closed to seal the bag, which did not help. The weight for this bag is impressive, but I do not recommend this bag if you are not willing to sacrifice important additional features for weight savings. This bag looses a lot of important features in order to reach this impressive weight.

love this for warmer weather hiking, packs super small

Super warm, very light. What's not to love? I stayed warm when it was 35 degrees F out when I layered up inside the bag.

I wish it fit me better though. It's literally a "you're to fat for the bag" problem, nothing bad about the bag. Lightweight, compact, warm, etc.

Great light weight sleeping bag, will keep you warm down to nearly freezing if wearing cloths and inside a tent. Nice bag for weight and compresses down surprisingly small. Good value for money. Would recommend.