Fabrics: Surrounding this high-quality insulation is a lightweight 15D nylon ripstop fabric. This lightweight fabric coupled with the down insulation results in a total weight of just 880g in this regular version. One thing we may have to note is the sewn-through design of the Cloud 800. Most bags and quilts we've tested use some sort of continuous baffle design. Continuous baffles theoretically keep more of the down fill between you and the outside, while a sewn-through design adds more opportunities for your body to be pressed next to the thin shell fabric at the sewn seams. The shell material doesn't add much insulation from nighttime temperatures. Most bags and quilts we've tested opt for the continuous baffle design as a way to tweak the warmth of the bag, as the continuous baffles allow you to shake the down through different parts of the bag.

The hood is fitting ok, but not great, meaning it’s too wide and sometimes hard to find the right position to have your head covered. 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. If you always wanted a lightweight, 800 fill down bag but never thought there would be an affordable one, here it is. If you share any of my frustrations with mummy bags the Cloud may help. If zipping together and snuggling with your tentmate is non-negotiable, well you can keep searching because this isn't your bag. Otherwise I give the Cloud an enthusiastic thumbs-up. In colder conditions, when overnight temperatures started to approach freezing, we did start to get cold – but here, the mat was the culprit, not the bag. Upgrading to a warmer mat (in our case, a NEMO Tensor Insulated pad, with an R-value of 4.2) hugely extended the viable temperature range of the Cloud 800 20F.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.

This 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. Design pros and cons: The sleeping bag is much more comfortable than a conventional mummy bag, the comforter does act like a blanket giving versatility to your sleeping positions. But side sleeping is comfortable only on your left side where you can move the comforter out of your nose and mouth; on the right side this is not possible, so you must sleep with your head over the hood. An adjustable hood can be cinched for added protection while an innovative self-sealing foot vent lets you slip your feet free from the bag for fast and easy ventilation on warmer nights. She’s right, Bobby Boucher! Sierra Design’s idea is to reduce weight in their sleeping bags by removing the zipper completely. And truly, does anyone really like sleeping bag zippers? They ALWAYS snag and catch the lining until the day when they fail altogether and basically turn your bag into a quilt or a prison. Sierra Designs just ditched the zipper and replaced it with a flap you can wrap around yourself.

Performance Comparison

Sleeping pad sleeve keeps pad under you for comfort and warmth and replaces unnecessary bottom insulation

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. Getting in and out of the bag is super easy since there's no zipper to fiddle with! I also found that the part of the bag that folds over you like a blanket stays nicely in place and is easy enough to throw off if you get too warm. 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!”I must first admit that the sleeping bag is too wide for me leaving empty space in it, and I probably should have bought the women's version. I guess that part of how it was designed, was to give you extra room for comfort. Plus, I’m relatively a cold sleeper. Disclosure : Trailspace received a sample of this product from the brand for field testing and review. The product was assigned by Trailspace to this volunteer Review Corps member. 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.