I was really skeptical with the zipper-less design of the bag but it proved to be a non-issue. It's quite a warm bag but I'm generally a warm sleeper so I may not the be the best gauge for that, but it seems to do the job well in that regard. Sleeping bags do not generate heat; they only trap the heat we produce, so it is vital that you get into your bag when you are giving off warmth, don’t go to bed when you are cold, have a hot meal or a hot drink or do some brisk exercise to get you nicely warmed up. We always recommend that you choose your bag according to the coldest conditions you will experience; you can always unzip a bag if it is too warm, but trying to sleep when you’re too cold is just miserable. Bear in mind that we are all individuals, so we all feel the cold differently and that our own resistance will fluctuate depending on a whole load of factors, including how much we have eaten, whether we have consumed alcohol, whether we need a wee or what kind of mood we are in!

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. 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. 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 features a generous pad sleeve to insert a sleeping pad in. To save weight, no down fill is located at the bottom of the bag where the pad sleeve fits.In the mountains you need your gear to be as light as possible and still able to do its job. Being light reduces fatigue and lets you move through hazard zones faster thereby reducing your exposure to risk. In short, light is right. The Sierra Designs Cloud 800 35's zipperless design and oversized comforter can help one find solace after a long day of hiking. 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. Sleeping pad sleeve keeps pad under you for comfort and warmth and replaces unnecessary bottom insulation

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. We paired this bag with one of Sierra Designs’ Granby Insulated Air Mats, which has an R-value of 2.1. This ensured that the bag was plenty warm enough for late spring, summer and early autumn camps. The high-quality 800FP moisture-resistant down lofts well, being housed in chunky box-wall baffles. The quilted flap can also be pulled right up to the chin, ensuring we experience minimal heat loss. Extreme: This is a survival rating where the user is likely to suffer health damage such as Hypothermia. It should be treated with the utmost caution and not be relied on for general use. 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.The pad sleeve is doing a great job keeping you centered on the mattress, but at the same time it prevents placing a pillow under the sleeping bag, thus it must be inside the hood, which takes most of its space. Inside the Marmot Tungsten UL 2P tent Easy to use and regulate temperature. Most comfortable sleeping bag experience yet. Temp rating seems accurate and materials are top quality. 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.