TETON Sports Celsius Mammoth 0° Sleeping Bag Ivy 10121S
TETON Sports Celsius Mammoth Double 0°F Sleeping Bag Ivy 10121S
TETON Sports Celsius Mammoth Double 0°F Sleeping Bag Ivy 10121S
TETON Sports Celsius Mammoth Double 0°F Sleeping Bag Ivy 10121S
TETON Sports Celsius Mammoth Double 0°F Sleeping Bag Ivy 10121S
TETON Sports Celsius Mammoth 0° Sleeping Bag Ivy 10121S
TETON Sports Celsius Mammoth 0° Sleeping Bag Ivy 10121S
TETON Sports Celsius Mammoth 0° Sleeping Bag Ivy 10121S
TETON Sports Celsius Mammoth 0°F Sleeping Bag Ivy 10121S
TETON Sports Celsius Mammoth 0° Sleeping Bag Ivy 10121S
TETON Sports Celsius Mammoth 0° Sleeping Bag Ivy 10121S

Celsius Mammoth Double 0°F Sleeping Bag

Sale price$199.99

Our newly redesigned Celsius Sleeping Bag leaves ordinary rectangular bags in the rearview with a modern angled baffle pattern and a handful of anything-... + Read More

Color:Ivy
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Free shipping on orders over $75*

Our newly redesigned Celsius Sleeping Bag leaves ordinary rectangular bags in the rearview with a modern angled baffle pattern and a handful of anything-but-basic hues to match your personal style.

But the Celsius is not just a pretty face—the double-layer construction and innovative fiber fill chase away the chill so you stay snug as a bug long after the sun goes down. We even added a cinchable mummy-style hood for extra warmth (bonus: it also keeps your camp pillow free of crud). 

Finally, we streamlined the sizes on our new Celsius Sleeping Bag line to make sure everyone sleeps happy. The Celsius Mammoth double two-person sleeping bag is the same as our previous Mammoth size (94" x 62") and features a durable polyester taffeta shell that's tough and easy to clean.

Camp on the bright side with Celsius.

  • Rectangular sleeping bag with mummy hood
  • Extreme rating for temperatures as low as 0° F / -18° C
  • Full-length shoulder and zipper draft tubes
  • Innovative fiber fill for maximum warmth
  • Anti-snag zipper and webbing
  • Angled baffle pattern with stylish color block design
  • Double I-zip zipper design makes an easy entry from either side of the bag
  • Interior phone pocket
  • Hang loops for easy storage
  • Includes durable stuff sack
  • TETON Sports Lifetime Warranty




A woman and her son with a sleeping bag with wildflowers in the background.

Prep for spring with

fresh new gear

Cozy sleeping bags and pillows ready for any adventure.

Two Numa packs sitting on rocks near a river.

Prep for spring with

Fresh new gear

Weather-resistant packs, go-anywhere blankets, and cozy pillows ready for any adventure.

TETON Sports Lifetime Warranty: Image shows four friends hanging out around a campfire, laughing together. They are surrounded by red rocks and there is TETON Mountain Ultra tent in the background.

Built TETON Tough

Our Lifetime Warranty

All of our products are backed by a limited lifetime guarantee. Our products are built to withstand whatever nature throws at you, but rest assured, our warranty will help get your gear repaired or replaced if anything goes wrong.

Product Reviews

4.6
Rated 4.6 out of 5 stars
Based on 18 reviews
Total 5 star reviews: 12 Total 4 star reviews: 4 Total 3 star reviews: 2 Total 2 star reviews: 0 Total 1 star reviews: 0
89%would recommend this product
18 reviews
  • B
    Benjamin
    I recommend this product
    Rated 5 out of 5 stars
    Aug 10, 2023
    Perfect for couples!

    Camping as a couple is usually a bit of a challenge, but sleeping in this bad boy made a huge difference in our quality of sleep! It’s basically queen sized so we had pleeennttyyyy of room to snuggle up. It also wicked away most of the sweat but I’d recomend outing a second sheet between the bag and sleeping bad since a lot of condensation built up underneath. Otherwise we loooved it and would recommend it to anyone needing a bit more space on their next camping trip!

  • RF Profile picture for Racheal Feuerbach B.facebook logo
    Racheal Feuerbach B.
    Verified Reviewer
    I recommend this product
    Rated 5 out of 5 stars
    Aug 9, 2023
    MAMMOTH IS A MUST!

    As someone who has been camping from a young age, I have owned many sleeping bags and can honestly say TETON Sports makes the BEST sleeping bags! This oversized two-person sleeping bag easily fits my 5'8" frame along with my partner and our dog. The plush poly flannel interior invites you to snuggle up for a cozy night of sleep and the cinchable mummy-style hood keeps me warm on those chilly nights. Plus the velcro closures makes sure cold air doesn't sneak inside. I also love the inside pocket that holds my phone or flashlight and the durable exterior holds up nicely to our dog running and jumping on it. It's a perfect addition for anyone who enjoys tent or car camping. Highly recommend this to be an addition for any outdoor enthusiasts!!

  • JY Profile picture for Jonathan Y.
    Jonathan Y.
    Verified Reviewer
    I recommend this product
    Rated 5 out of 5 stars
    Aug 7, 2023
    Perfect Family Bag

    This is the perfect family bag. We just wrapped up an unforgettable car camping trip, and I couldn't have asked for a better companion than the Teton Sports CELSIUS MAMMOTH 0°F Sleeping Bag! From the moment we crawled inside, I knew we were in for a cozy night's sleep. The 0°F rating was spot on, as we stayed warm and toasty even when the temperature dropped during the night. The spacious design allowed us to sprawl comfortably, and the soft lining felt like sleeping on a cloud. It's the perfect balance of roominess and insulation for camping adventures! Not to mention, the durable materials and quality construction reassured me that this sleeping bag is built to last. Whether it's a weekend getaway or an extended road trip, the Teton Sports CELSIUS MAMMOTH is a must-have for all campers seeking ultimate comfort and warmth. We embraced the joy of car camping with this fantastic sleeping bag - highly recommended!

  • F
    FTD
    Verified Reviewer
    I recommend this product
    Rated 5 out of 5 stars
    Jul 28, 2023
    Home comfort in the outdoors

    Ok first of all this thing really is mammoth! Usually 2 person bags are really 1.25 person bags, but this is truly a 2 person bag. Secondly it is very warm, very soft, and very comfortable, just like wooly mammoths probably were. I've been camping for 10+ years and this bag really hits home for car camping. Highly recommend!

  • EW Profile picture for Elisa W.google logo
    Elisa W.
    Verified Reviewer
    I recommend this product
    Rated 5 out of 5 stars
    Jul 25, 2023
    Perfect for families

    I got this sleeping bag because I am always worried about my kid’s temperature when we camp and this sleeping bag eases my mind because we are all in one bag and it has a very warm rating.

    Other than that this sleeping bag is super luxurious inside. It is so comfortable and squishy. I put it on top of an air mattress this past weekend in RMNP and it felt like sleeping on my bed at home.

  • RC
    Rachel C.
    Verified Buyer
    I recommend this product
    Rated 4 out of 5 stars
    Apr 8, 2024
    Great quality

    I wish that sleeping bag fully separated in to 2 pieces

  • WP
    William P.
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    Apr 7, 2024
    The bag worked as expected for us 2 oldies.

    Went camping this past weekend in the mountains of NC and the bag kept us toasty. My wife and I are 68 and still love to tent camp. This is our second Teton queen sized bag. The Celsius bag worked well for us and we have no complaints. The interior fabric is soft, comfortable, and warm.

    We recommend the bag.

  • EA
    Eva A.
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    Mar 11, 2024
    Amazing bag!

    Tons of room and warmth!

  • CJ Profile picture for Creeker J.google logo
    Creeker J.
    Verified Buyer
    I recommend this product
    Rated 4 out of 5 stars
    Mar 11, 2024
    Very warm and comfy

    Finally had a a chance to try it out for the first time. The night dipped in the upper 20’s and I stayed very warm and comfortable. The construction is good and the zippers are smooth.

    Only down fall is the bulk. I had planned on keeping it my rooftop tent but the bag is too big to to allow the tent to close. I order an oversized bag to pack it in. I’d have to be a magician to fit this in the bag it came with.

    I would definitely buy this bag again but doubt I will wear it out any time soon.

  • RF
    Ron F.
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    Mar 5, 2024
    Celsius mammoth double 0 F degree sleeping bag.

    Very nice and warm sleeping bag, and lots of room!

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We believe the outdoors is there for everyone to enjoy. Whether you're blazing a new trail or just want to add a little fresh-air time to your hectic schedule, the outside world is waiting for you. We make the gear that will get you there.