Mammoth 0°F/-18°C

Updated review in May of 2021 after owning for over 10 years! (Purchased March 2011) I stand behind my original review, and can even expand it further. I've had this bag out solo, doubled up with the wife, and in temps all the way down to -16F on an unexpected, freak event of a night. This bag has paid for itself so many times over I've lost count. It's still going to be too much when the lows are probably 45F or better, but hey, you can just unzip the top from the bottom and use one side as a blanket instead! I also recently picked up the Teton Sports Cascade double sleeping bag, and didn't even have to think twice. Have used that one this spring and plan on using for summer over dragging bed sheets and a well used blanket around. May have to zip the top off and use as just a blanket, but we'll see. Point being that be cause of the Mammoth bag, and a couple other Teton Sports products, I didn't hesitate to buy another one of their products sight unseen. Didn't feel I needed to based on experience with their products, their outstanding customer care, and their warranty to back it all up. Great gear that doesn't have to break the bank for some big directional name being put on it. Looking forward to the next 10 years with this bag, and the other gear I have from Teton Sports! -------------------------------------- Original review below: -------------------------------------- Spacious, yet still warm for one. With two, it's even better. When it comes to camping, one thing you can't skimp on is your sleeping bag. It needs to be comfortable so you can get some good sleep. It also needs to be the right specs for the weather you'll be in. I spent several nights in this bag recently, with half at or just below the freezing mark while the others were a little warmer. I think the warmest night was mid 40's, and to be honest, it got a tad warm. That wasn't a big deal though, and to be expected with a 0-degree rated bag. I will say I was by myself on this excursion, and slightly concerned beforehand that with it being a double bag it may not be warm enough. On the cold nights, I was very warm. Not one problem at all with it being so big. This bag fit on top of my queen mattress just right, and was never an issue. I crawled in, and within a few short minutes it was warmed up like a champ. I had a nice blanket between the bag and the air mattress, which helped insulate the bag from the air of the mattress. This bag would have been good down to lower temperatures easily. I would estimate 15 degrees, maybe 10, based on the warmth provided in the upper 20's. When the temperature at night was in the mid 40's, it got a hair warm. That's OK, I like it that way, but this would be too much bag for much more. For light winter, spring or fall (when the temps are chilly at night), this bag is awesome. For summer, you will roast. The quality is very, very good. To be honest, this bag exceeded my expectations. If only they made a similarly sized bag that was a little lighter weight for summer, I'd be a happy camper. If you take care of this bag, it will certainly last you a long time. Store it right, clean it right, and you will be very satisfied.

We had a camping trip in the Rocky Mountain National Park coming up in the fall, temperatures were supposed to be in the low 30s, or even upper 20s. This was one the first bags we saw when looking around, and we just couldn't stop thinking about it! It looked so roomy, so comfy, so warm, and the idea of a double sleeping bag was very appealing, specially in cold weather. So we went for it! Well, since I'm writing this review, you can assume we not only survived, but it was a great choice! Here are our pros and cons from our experience in Colorado: PROS: 1. High quality: right when you take it out of the box you know it's a good product. The inside feels like flannel. Zippers and seams look strong! 2. Roomy: this thing is huge, I'm 6 feet tall, and both my wife and I could fit inside with plenty of room for another small person. 3. Comfy: I'm just going to say that there is a very thin line between sleeping in your bed and inside this sleeping bag, very very fluffy. The inside is similar to flannel, so it's not too cold when you get in. 4. Warm: I gotta say, before seeing this bag, my wife was skeptical we wouldn't be cold at night, but our nights were perfect, we couldn't wait to get to bed. We both slept with very light clothes and bare foot. Temperatures were in the low 30s every night. 5. Details: some details are worth mentioning... there are zippers all around, so if someone is too warm at night, you can open the sides to increase ventilation. There is a mummy hoodie that helps close down if you're still not warm enough. There are some velcros to prevent you touching the zippers or opening them accidentally. CONS: There are no cons!!! I would say there is actually one side effect to so many pros... 1. Size: well, as you'd expect, it's very bulky and heavy! But hey, how would it not be, right? Some reviews talk about being difficult to put it back in the stuffing bag, but we did not have a problem at all! Fold in the middle, stuff it all the way to the end, and then stuff stuff stuff the rest! It really (to our surprise) wasn't as bad as we thought. Bottom line is, amazing bag!! You won't be disappointed. Just don't expect to go hiking a 10 mile trail with it! :)

We bought the Teton Queen Sized 0 deg Sleeping Bag a few weeks ago and finally used it last weekend. All the other reviews are correct, this bag is completely warm even on a 38 degree night, if anything I was too hot in the bag. The zippers on either side let me unzip my side while my wife kept hers zipped. We will be camping in 3 weeks up in the North Carolina mountains and it is likely to go below freezing and I am confident we will be completely warm, at least until we have to get out of it to get dressed. I don't think the "flannel" lining is cotton flannel, it feels more like a synthetic flannel-like substance, which I think is actually better. Cotton flannel will not last as long as the synthetic, and would stay damp longer if you sweat. But the synthetic lining is as soft as real flannel. My wife and are pretty skinny so there was room enough for a third, though we could not find any takers :). The one thing that seems up for debate is getting it back into the bag when done. Let's be clear, it is a stuff sack, which means you are supposed to stuff it back into the bag, not try to roll it. We timed it and together it took us less than two minutes to stuff it back in, and took me about 3 minutes doing it by myself. Just keep stuffing and packing and stuffing and it will all fit. It is heavy, definitely not something you will be carrying around backpacking, it is meant for tent camping where your car is within a few hundred feet of the campsite. My only negative is that the "mummy hood" that closes with a draw string does not really work the same way that it works on a mummy bag designed for one person, which is to tighten the string until just your face is showing on those really cold days. There is no way to draw the string in on the Teton so that just both your faces are showing, unless you are cheek to cheek, which is not a real practical way to sleep when next to someone, no matter how much you love them. It would be better if they had two mummy hoods on this, each with its own drawstring so each person could tighten their string to enclose just their own face. Overall this bag is great, it is completely comfortable, warm, soft, & large enough for two oversized campers or three skinny ones. Downside is that it is too heavy for backpacking, but for those trips you each bring your own mummy bag instead. Be careful when ordering, there are two versions of this bag, a 0 deg bag and a 30 deg bag, make sure you get the right one. UPDATE: We camped in the NC mountains in mid November and the last night it was so cold, the gallon plastic bottle of water in the tent froze solid. We were absolutely warm in the bag despite what we learned the next days was a 12 deg night. So with 2 people in it, I can't imagine this sleeping bag being cold at any temperature. Getting out of it in 12 deg weather in the morning was a bit of a shock, but inside the bag was fine.

Okay let’s start with the only Con being it’s HUGE. The only reason this is a con for me is because it’s impossible to get this thing back into its bag. That’s the only reason I’m knocking off one star. Hopefully this company can see the many complaints from customers about this issue and can provider a bigger bag in the future, for better storage. Now for the Pros: -This thing is HUGE and SO comfortable! It kept us warm the whole night, at times even a bit too warm. We seriously didn’t need any blankets at all, just this giant monstrosity!! Honestly this thing would easily be a 5 star sleeping bag if only we could store it away a lot easier. Nevertheless, I highly recommend anyone who is a serious camper (especially for those who camp in cold weather) to buy this. You need it! The price is a bit steep but so worth not being cold at night!!

We have had this bag for five years, and it has been *amazing* for summer tent camping in the Rockies and late fall and winter tent camping in NW Arkansas. As everyone else has pretty much covered, it's soft, warm, and difficult to get back in the stuff sack; it's also heavy and takes up quite a bit of room in the vehicle. But the pros far outweigh any cons. Before moving to Arkansas, we camped in the Sierras regularly, and night time temps in the 20s F in June and early July were pretty typical. We had supposedly warm mummy bags, but my posterior (a-hem) was always like ice, and I would wake up constantly during the night from the cold. My husband is the opposite, he's a furnace when he sleeps. So on our first trip out to Colorado for a week of camping after moving to Arkansas, I knew I needed to harness his heat with a shared bag. The first night (30s F) with this bag we went to bed with our typical North Face base layers...and we were hot. Next night we slept in regular pajamas (cotton sweats, yoga pants, t-shirts) and were perfect. I had my first night's solid sleep camping as an adult, and I have never looked back. Since then, we have used it as low as 17 F degrees (real; real feel was lower), but did top it off with another blanket just for added insurance. We also bought a tri-fold memory foam mattress (talk about taking up a lot of space in the truck bed) to help mitigate my fibromyalgia aches (air mattresses are awful support), and the comfort and warmth wrought by the combo of the mattress and this bag felt, in my husband's words, "ridiculous." When we finally acquiesced to the reality that tent camping and aging fibro-Me was not going to work much longer and bought a 16 foot travel trailer, we assumed we would keep using the bag. We stopped that pretty quickly because it was *too* warm. We have the 0 Degree bag; the 20 degree bag probably would work better in a travel trailer, but I'm just as happy under quilts when it's 60 in the trailer (our plans of being brave little luxury campers and foregoing heat was halted when we realized we had to keep our pipes warm, so the furnace is a must in the cold weather). So our super duper sleeping bag has been in our closet for a year, until this frigid arctic blast plunged Arkansas into a deep freeze. Our room in our house was 45F, but in a tank top and pajama bottoms and no socks, I still kept throwing back the covers quite a bit to cool off. That's not a complaint--I've been super grateful for the warmth the past few days, and am so glad we had this to make this mess all a bit easier. The only drawback is the practical inability to launder the bag. We ended up purchasing a queen size double liner that we could wash regularly, and that's worked out fine, though I missed sleeping against the super soft interior of the bag itself. The outside of the bag has stood up well--it still looks new, imo, despite two generations now of big dogs sneaking naps on it. And we have never had any problems with the zippers. It also has never felt damp when camping in continuously rainy weather. This is one of those purchases I am grateful I made. I would consider it essential to tent camping in areas with low overnights, but it also gives me peace of mind for future winter power outages--we might be uncomfortable if the temps in the house match outside temps, but we won't freeze.

Backstory: my wife is pregnant with our 2nd and wanted to go camping with our 2 year old daughter before we were tied down with a second for a while. I made reservations for the weekend and ordered up this bag along with a Eureka Children's Sleeping Bag for my daughter. This happened late on Wednesday, we just squeaked in before the deadline on the Friday guaranteed delivery date with prime. I should also mention that the wife wasn't too happy with what this bag cost, but that wouldn't last long. This bag was shipped Fedex, the other one was UPS. This one arrived mid-day on Friday, but by the time we had to leave town, my daughter's bag hadn't been delivered yet (thanks UPS!). Grabbed the contingency plan for the kid, a 45 degree adult sized bag, and hit the road. Fast forward about 6 hours, it was a chilly evening and my daughter, who's never camped before, woke up not happy. After a few minutes of trying to console her I asked if she wanted to come in our bag. She responded yes, I moved her in between us, and that was about that. Up until then I slept like a rock, after she joined us it wasn't quite as nice (she decided a 45 degree angle was the right orientation for the night) but all 3 of us slept fairly well until morning with a decent amount of room to go around. If my wife and I had individual bags I don't expect it would have gone as smoothly. Needless to say that made up for spending a bit more than she would have liked. From a more objective standpoint, the bag and it's stuff sack are enormous. It dwarfed the duffel that holds my Kelty Green River 4 tent. Luckily we camped out of a Ford Econoline van so it wasn't an issue. I was a bit worried that the 0 degree rating would make it uncomfortably warm, but I slept pretty well in ~40 degree weather. Never too hot and if I was, easy enough to open the side zipper from the bottom or top and let in some air. The construction is good, draft tubes in all the right places, the pillows stayed where they should have, and the lining is quite comfortable. I was expecting a bit softer of a flannel finish, this may change over time but as new it's a fairly smooth finish, more similar to the normal synthetic finish of a sleeping bag. We were on two ALPS Mountaineering Lightweight Series Self-Inflating Air Pad side by side and between that and the insulation in the bottom of the bag, the padding was just fine. It's also a well thought out bag. When we packed up I unzipped the 2 halves and shook them out, then hung them over the railing when I got home to air out. Putting it back together was a cinch, 3 zippers and about 30 seconds and it was ready. I agree with one of the other reviewers, stuff the sack starting with the bottom or top (don't try to roll it) and just keep smooshing it in, it'll fit. When packing it up at home I inadvertently put the bottom and top in before stuffing the middle part, made it much harder, so make sure to go from one end to the other to save the headache. The compression straps help get it to a very slightly more manageable size, but let's be honest, this isn't going to be carried on your back or anything, so who cares about the extra 2 inches or so of size. All things considered, awesome car camping sleeping bag. If you're buying this thing you know what you're getting, not some super sleek lightweight high tech bag, but a beast of bed that you can comfortably splay out in and get cozy. For that purpose it hits the mark dead on and I can highly recommend this to anyone.

This sleeping bag is great. I purchased this sleeping bag because I was looking for a better sleeping bag for when I go camping. Many camping trips I have gotten cold at night while sleeping which made for a miserable nights rest. Where I live its 4800 feet in elevation before I even leave for the mountains so the weather can change to snow in a heartbeat. Very warm sleeping bag and I have taken it camping when the over night lows here were 27F. This sleeping bag is also nice and large so my wife and I have plenty of room to turn over in our sleep with out feeling too cramped together. Nice heavy duty zippers operate smoothly and if they do catch the fabric just reverse the zipper and it unsnags very well. The outer shell of the back seems to repell any water or moisture pretty well but of course we use ours in a tent with a rain fly. The inside of the sleeping bag is very comfortable and is very thick and reminds me of flannel sheets. Very soft and comfortable. Now for the bag it comes in. It is a compression sack but oh boy its a pain to get the sleeping bag back into it. It takes quite a bit of effort to stuff the sleeping bag into it. Forget even trying to roll the sleeping bag up and put it into the bag. The video I watched on it does show that it is just meant to be stuffed into the stuff sack but it does take some effort. Overall this is a really great and warm sleeping bag and worth every penny in my opinion despite the frustration to get it into its storage bag. Best sleeping bag I have owned to date.

I ordered the green Teton 0F Mammoth bag and this thing great, it is massive, super thick and cozy. Honestly the bag in the photos seemed smaller to me for some reason, I have never seen a sleeping bag this large in person. Did I mention this bag is massive. Its huge, ginormous, prehistorical in size... its a behemoth! Our ancestors might have chased it with spears to harvest its stuffing. So much fluff! And were talking the good kind of fluff here... If I were to describe it would be like the thickness of the fluff is 6-10 college type Queen comforters covered in ripstop zippered together. Getting it out and putting it back in the stuff sack is one hell of a challenge, almost like one of those carnival games where if you can best the unbeatable game you get a massive stuffed prize. I feel like a few more inches added to the stuff sack would make this more appealing and not a cruel joke for some people lol. For example when fully in the stuff sack the compression straps almost literally do nothing, thats how tight of a fit it is. Took about 6 minutes timed to get it back in. Just don't give up on getting it in or out of the stuff sack, or cut it off like the lady who reviewed before me lol. Do not take it out of the stuff sack in a place you do not want to store it or use it, even carrying it around out of the stuff-sack is cumbersome lol. I do feel like this gear addition is one of those multi "pro" and multi "con" type scenarios for car camping situations where interior space is a concern. I have a mid size car-uv and its pushing it packing this thing in there with other desirable gear. IF you sleep in a truck bed topper or a situation and can just leave it un-sacked this would be the best thing ever. Do I prioritize sleep comfort in my tent over breathable space in my car while traveling? Absolutely, and I'm glad I did. Jokes aside I love it though. It is everything i wanted in an OVER-SIZED sleeping bag and more, a lot MORE. More than I bargained for but when is that really a bad thing? I think I will really enjoy not being wrapped up like a mummy or straight jacket will be a game changer to my forest comfort. Due to the shear thickness of each layer, zipping/unzipping this thing works better than any sleep bag I've ever used, very smooth, did not catch (yet). I have not tested the warmth yet but it has all the appearance of something that will definitely live up to the 0F selling point. I might even get too warm in it. I tend to sleep with my bags open and over me with my feet in the mummy bag so I love that i can unzip each sections if i want it act as a comforter. I've slept in 20F down bags with a few layers, including insulated snowboarding bib and emergency bivvy in 13F weather and been still got cold so a 0F bag was desired. Is this bag perfect for everyone or all situations, probably not due to its size and challenge to store but Its exactly what it says it is, and if you have the room for it, someone to re-sack it, and the need for a cold weather bag where you will feel cozy this is it.

Primero que nada PARA GUARDAR EL SLEEPING DE VUELTA EN SU BOLSA sólo basta meterlo hecho bola, uno tiende a pensar que hay que enrollarlo y luego meter el rollo en la bolsa del sleeping, pero resulta que no es así, basta con meter una orilla del sleeping y seguir metiendo el resto del sleeping así hecho bola en la bolsa, sin tener que enrollarlo ni nada, nada más lo metes como puedas y así es el chiste con los sleepings, no tiene ciencia, nada más comenzar por un extremo y seguir metiéndolo sin ningún orden ni técnica. Pueden ver tutoriales si en youtube buscan "How to Stuff the Mammoth Sleeping Bag into its Stuff Sack". Ahora sí el review: El sleeping está perfecto, perfecto, es súper resistente, muy acolchadito y extremadamente calientito. Yo nunca había visto un sleeping tan grande como este, tan grande y pesado. Pero lo cierto es que es sumamente calientito. Incluso podría decir que está de más de calientito, yo casi no paso frío pero mi novia sí, así que lo compré esperando que estuviera cómoda mientras acampábamos en el Parque Nacional del Chico, en Hidalgo. Por la noche la temperatura estuvo como a 6 grados y ella estaba sùper cómoda pero yo estaba incluso sudando, de hecho el material sintético del que está relleno hace que la humedad se vaya al piso, dos noches el sleeping amaneció mojado de mi lado, dado que no se derramó ningún líquido creo que mi mismo sudor se fué al piso, haciendo que mi lado quedara mojado, eso sí nunca me había pasado en otro sleeping, realmente amaneció mojado. Creo que eso puede ser una ventaja, en lugar de que el sudor humedezca la parte interna se vá al fondo del sleeping que amanece mojado. Creo que el sleeping está un poco sobrado para las temperaturas en México, pero es un hecho que si lo compran no pasarán ningún tipo de frío, está perfecto si lo que buscan es el sleeping más calientito que puedan encontrar. Sin embargo el sleeping es grande, encontré que las medidas son exactamente las de un colchón de tamaño matrimonial, queda exactamente sobre la superficie del colchón, si necesitan darse una idea es exactamente así, lo que mide un colchón matrimonial, ese es el tamaño del sleeping extendido, perfecto para una pareja; el sleeping ya empacado es un cilindro que mide algo así como 80 x 50 cm ya comprimido y es muy pesado, no tengo báscula a la mano pero debe estar cerca de los 8kg. Es enorme y sólo lo recomendaría si vas a viajar en coche, porque irlo cargando no es opción. Sí lo recomiendo, a mí se me hizo de más de calientito, pero eso te asegura que soportarás temperaturas de hasta unos -5 grados centígrados, fácil.

⭐⭐⭐⭐⭐ The Teton Mammoth Double Sleeping Bag has quickly become one of our favorite camping essentials. We love how big and comfortable it is—it feels more like a cozy blanket than a traditional sleeping bag. The extra space is perfect for relaxing after a long day outdoors, and the soft, roomy design makes it easy to move around while sleeping. We especially love that it’s large enough to share and gives us that extra comfort we look for when camping as a family. It keeps us warm during cooler nights, and the quality feels durable enough for many camping adventures. It’s also great because it can be opened up and used more like a blanket, giving us more flexibility at the campsite. If you’re looking for a spacious, comfortable sleeping bag that feels like bringing a little bit of home into the outdoors, we highly recommend the Teton Mammoth Double Sleeping Bag. It has made our camping nights so much more enjoyable!

キャンピングカーで使用するために購入しました。 身長177センチと167センチの男女2人で寝て、幅、長さ共に十分過ぎる大きさです。更に小学校低学年位の子供ひとり入れる位の余裕があります。 外気温マイナス5度で、キャンピングカー内の暖房を消して寝ても全く寒くなく（キャンピングカー内の温度は不明ですが、おそらく10度以下）、むしろ2人で寝ているので暑い位でした。 内側がネルっぽい生地なので、ツルツルの生地に比べて滑りはイマイチですが、大して気にはなりません。 収納袋には一度出したら二度と入りません（笑）ので、覚悟しておいた方がよいです。 キャンピングカー利用としては100点の商品です！ ちなみにマットはハイランダーのスウェードインフレーターマットダブルを買いました。これまた大きさピッタリで快適です。

Warmer than the sun. Seriously comfortable with more room than a Christmas sweater. Excellent quality

El único punto débil de este grandioso producto es la mochila de transporte, el sleeping bag llega en una caja enorme, la bolsa de empaque es grande y se encuentra muy bien comprimida. Cuando sacas el sleeping te quedas sorprendido del verdadero tamaño del Sleeping caben perfectamente dos personas con el espacio suficiente para moverte y no molestar a tu pareja, el producto cumple con lo que promete y nuca mas pasaras frió, tiene aberturas en cada lado para la ventilación por si llegas a tener demasiado calor por la noche, lo malo es muy difícil volver a guardar el Sleeping en su bolsa de transporte, esto es imposible :( ************************************************* Actualización ************************************************* Después de ver un vídeo descubrí que no es necesario volver a doblar el sleeping sólo es ir metiendo poco a poco en la bolsa sin seguir un patrón definido. Ya lo probé y sólo me tomo 3 minutos volver a colocarlo por lo que pongo las 5 estrellas