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  • Therm-a-Rest - Saros Sleeping Bag: 33 Degree Synthetic - Celestial Blue
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  • Therm-a-Rest - Saros Sleeping Bag: 33 Degree Synthetic - Celestial Blue

Therm-a-Rest Saros Sleeping Bag: 33 Degree Synthetic

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    • Celestial Blue

    3 Reviews


    Sleep like a baby out there.

    Hit the Pacific Crest Trail with the Therm-a-Rest Saros Sleeping Bag in your backpack, and revel in three seasons of blissful sleep. Since this sleeping bag is insulated with synthetic insulation, you won't have to pamper it in the backcountry as you would with a down bag, as it will retain its insulating properties if it gets wet. This full-featured bag is fitted with a draft collar and tube, as well as an anti-snag zipper, so you aren't struggling with your zipper after a long day of hiking. An external zippered pocket is a great place to stash a headlamp, and the adjustable hood can be cinched down to keep your dome warm throughout the night. Like all Therm-a-Rest sleeping bags, the Saros features SynergyLink mattress straps, which allow the bag to be securely attached too your sleeping mattress for a warm and comfortable night's sleep, no matter how much you roll around. 

    • 33F EN comfort rating
    • 25F EN lower limit
    • EraLoft synthetic insulation
    • 30D polyester fabric
    • Mummy shape
    • Adjustable hood
    • Draft collar and draft tube
    • Snag-free zipper
    • SynergyLink mattress straps
    • External zippered pocket
    • Stuff and storage sack included
    • Item #CAS003E

    Tech Specs

    30D polyester
    Max User Height
    [regular] 6 ft, [long] 6 ft 6 in
    Shoulder Circumference
    [regular] 62 in, [long] 64 in
    Hip Circumference
    [regular] 58 in, [long] 60 in
    Foot Circumference
    [regular] 40 in, [long] 40 in
    Draft Tube
    1 external zip
    Fill Weight
    [regular] 1 lb 15 oz, [long] 2 lb 4 oz
    33 F
    European Norm Comfort Rating
    33 F
    European Norm Lower Limit Rating
    -8 F
    Storage Sack
    Stuff Sack
    Stuff Size
    20 x 46 cm
    Claimed Weight
    [regular] 2 lb 15 oz, [long] 3 lb 3 oz
    Recommended Use
    backpacking, camping
    Manufacturer Warranty

    Tech Specs

    • Reviews
    • Q & A

    What do you think about this product?

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    Don't Use Without a Pad

    • Familiarity: I've put it through the wringer

    I own the 20 degree version of this bag and I've basically lived in it for the past 6 months. It's comfy, packs down OK. The pad straps are pretty sweet, keeps you right on the pad and eliminates getting really cold from rolling off the pad in the middle of the night. Not good for hammock camping without a pad, or any camping without a pad. The material that sits against your entire backside is not insulated and is a thin piece of fabric. When you have a warm pad its not really noticeable. Without a pad my rump got too cold to fall asleep.

    Good Synthetic Bag

      I bought this as a gift for a friend. He has the following to say about it-

      I bought this bag along with the Therm-A-Rest ProLite plus sleeping pad. Together they work great. The temps plummeted down to the low 30s after a hiking in the low 70s all day. The low fill in the bottom of the bag wasn't an issue but I wouldn't recommend this bag without the sleeping pad attached. I was able to move around without slipping off the pad which is great because I toss and turn a lot. I do wish the bag was a little more compatible however. Overall I am happy with this set up.

      Nice bag - but returning it

      • Familiarity: I returned this product before using it

      I actually like this sleeping bag. Nicely built, compacts well, good features (like dual pulls on the double zipper). But I found a bag on sale elsewhere that compacted even better than this one. Also the face port on this one doesn't seal up / close up as much as I'd like (it's a little too wide), whereas the other bag I did buy (from REI, the Lumen), had a smaller face port that sealed up better. And that REI one was on sale... but this Saros bag would TOTALLY make me happy if I received it as a gift. It is designed to be thin on insulation on the bottom (back), which made me concerned that since I sleep on a Thermarest cot, my back could get cold. Not sure tho, not tested. Again, it's built very well... I hope I don't regret sending it back!