Sierra Designs Cloud 800 35°F Sleeping Bag | Deep Dive - Outdoors Magic

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Sierra Designs Cloud 800 35°F Sleeping Bag | Deep Dive

New from Sierra Designs, a remarkable new sleeping bag that's completely zipperless

Here’s the latest eye-catching release from Sierra Designs, a brand that, since 1965, have been coming up with some serious outdoor innovation. It’s a sleeping bag that’s like no other. Why? Because there’s no zip, and no poppers either for that matter. Called the Cloud 35° it’s kind of like a sleeping mat and quilt combined, a design that Sierra Designs reckon could potentially bring you the most comfortable night’s sleep you’ll have in the backcountry.’ 

Its zipperless build features an integrated comforter that hugs you in a cocoon-like wrap. You simply tuck the flap of fabric around your shoulder and the friction with the outer parts of the bag will keep it held shut, sealing out any drafts and feeling comfortable rather than constricting.

These bags are mighty light too, with the lightest option coming in at 652g and the heaviest at 822g. More often than not, when you’re out shopping for outdoor gear, you end up sacrificing comfort for lightness and vice versa. The Cloud 35°, however, seeks to find a bridge between the two with its comfortable and feature-packed design.

Here’s a breakdown of what Sierra Designs have done with this sleeping bag, and how it could be the piece of kit you’ve been missing.  

Who is the Cloud 800 35°F sleeping bag for?

If you’re a camper who likes to splay out a little bit more than you’re allowed to in a conventional mummy sleeping bag, the Cloud 800 will be right up your street. The zipperless design allows for more flexibility of movement as well less faff with jammed zips in the middle of the night. You can wrap the comforter as tight or as loose as you please, depending on temperatures and tastes alike. 

Additionally, if you’re someone who has rolled off their sleeping mat one too many times, the Cloud 35° features an integrated mat holder on the rear to securely send you off to sleep. 

Cloud 800 35°F Features

In terms of features, there’s a lot to work with here. One of our favourites is probably the self-sealing foot vent which allows for fast and easy ventilation. This patented trait makes the Cloud ideal for summer nights when you need a little bit of cool air but don’t want to be entirely out of the sleeping bag (though it’d probably be nice to lie on top of too).  

The integrated comforter can similarly be moved out of the way on hot nights, whilst the adjustable hood can be cinched tight in colder temperatures. This additionally means you can walk around your campsite with your feet and shoes on the ground but your body wrapped in the sleeping bag. 

The hood is also roomy enough for a camping pillow, and you’ll find an integrated pad sleeve on the rear. This sleeve can accommodate mats with a circumference from 115.6cm to 141cm and is a necessity if you want to stay warm. 

Related: How To Pack A Rucksack For Hiking | Advice For Backpackers

The Cloud comes in 35° and 20° options – with a women’s fit option for the 20° bag – and it can be tucked away neatly in a compact stuff sack (33 x 18cm for both sizes).  

As hinted in the name, the temperature comfort limit of this bag is approximately 35 degrees Fahrenheit (2 degrees Celsius), with its absolute limit being 26 degrees Fahrenheit (-3 degrees Celsius).  

The comforter and foot vent can be opened up on warmer nights.
The integrated sleeping mat sleeve is found on the rear of the bag.


The Cloud 35° is constructed with PFC-free 800 fill power DriDown®. In case you didn’t know, DriDown® is the same as your usual down insulation, but it’s improved with a hydrophobic treatment that keeps rain, sweat or any type of moisture from soaking into your bag. It’s also designed to allow any internal moisture to escape easily, keeping you dry much faster, and for much longer. 

You’ll find this DriDown® insulation sewn-in throughout the top and sides of the bag to aid its lightweight design, though it’s mostly found on the right-hand side of the bag so you can easily slide in through the left.  

The shell and liner fabrics, on the other hand, are made from a 15D ripstop nylon for optimum strength and durability. This, coupled with the water repellant down insulation, makes for a very tough and thermally efficient sleeping bag. 

The Verdict

The Cloud 35° really stands apart from the crowd but without falling flat when it comes to performance and it’s therefore no surprise that this thing has managed to pick up a number of awards.

At 653g and with a comfort limit of -3 degrees it’ll certainly suit anyone who likes to take a lighter approach on the trail – particularly anyone who tends to find normal sleeping bags a bit restrictive. 


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Main Photo: Sierra Designs


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