Ultralight sleeping bags generally weigh about two pounds and compress into small sizes to occupy as little space as possible. The low weight of these sleeping bags generally correlates with the cost, so if you’re not looking to spend a few hundred dollars on a new bag, opt for a slightly heavier one to save money.

The Sierra Designs Cloud 800 35's comforter could come off from under your shoulder if you roll around in the bag - something side and active sleepers should note.

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Many bags are useless to side-sleepers because they have a fixed shoulder box shape. With the Cloud the shoulder area can conform to the way you sleep. You can even wrap it up under your head like your favorite blankie from home. This womens version has 419g of 800 Fill Power DriDown that has a -3°C Comfort Limit so its good for two to three season use, particularly if you're a warm sleeper. The fabrics used are 15D so they are lightweight but also more than many of the lightest bags out there. The dimensions of the bag are generous so it would suit someone after a larger bag, someone who moves around a lot at night and warm sleepers. The overall weight is really impressive given all the features too. If you don’t want the restriction imposed by a zipped bag and don’t fancy a quilt because you move around too much at night then the Cloud 800 bags deliver unrestricted rest when you want it and warmth when you need it. I’ve included some pictures of this bag in its storage and stuff bags with comparison items. With a compression bag you could get it even smaller if that’s your preference. I finally got to try this bag out this past weekend on the Buffalo River Trail in Arkansas. The temperatures at night ranged from around 45-55° so I wasn't truly able to test the warmth of the bag. I found no drafts in the bag, except if you don't put your feet in the right way, they slide out of the footbox in the slot.

As Rainey implied, nothing is perfect. My biggest gripe with the Cloud is that I cannot carry it when I go into the mountains with my wife. I’ll explain: Unlike all men and women’s REI sleeping bags, the Sierra Designs Cloud cannot zip together with your partner’s sleeping bag because, duh, it doesn’t have a zipper! My snuggle-loving wife says, “BOOO!” The construction is well made although the fabric is lightweight so you'll have to be a bit carefully with handling. Unless you are really rough on your gear there's no reason this bag won't last for years to come.Comfort Rating: This is the temperature at which an average female should experience a comfortable night’s sleep. On average, women sleep colder than men, so this rating is some degrees above the "comfort lower limit" for a man. Those interested in where the down in your bag was sourced (or Portlandia fans) will rejoice that Sierra Designs lets you know where the hardworking geese who made your bag lived out their final days. I scanned the QR code on my bag and learned that the down in my bag was from a Chinese source. It makes sense, I understand that they eat a lot of goose there and I’m glad they saved the down for my bag. Another headache in sleeping bags in that your warm, cozy feather cocoon becomes stuffy and unbearable on those nights that AREN’T really cold, making you either unzip in the middle of the night (that zipper again) or have to own a quiver of bags for each temp range. Sierra Designs seeks to partially alleviate this with a flap closure and foot vent that allows you to easily bleed-off heat at night without dealing with a zipper. The Cloud 800's biggest strength may be in its comfort. After all, its most unique feature that makes it stand out from all the other products we've tested is its oversized comforter. While many of the bags reviewed cut weight by keeping the fit trim, the Cloud 800 has a more than generous fit in the shoulders due to the fact that the zipperless design allows you to open up the bag as much as you would reasonably like. This could be especially appreciated to those who feel claustrophobic in other ultralight mummy sleeping bags. To help you on your quest for a light load with gear that still works and doesn’t require a trust fund, Sierra Designs brings us the Cloud 20. This bag seems to do a good job of fixing a few common sleeping bag complaints.