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I’ve spent plenty of nights testing both the TETON Sports Celsius Regular (rated at 0F) and the TETON Sports 20F Mummy bag, and they serve two very different crowds. The Celsius is a roomy rectangular bag with a cotton lining, while the 20F Mummy is a lightweight backpacking bag that packs down small.
If you’re trying to decide between car camping comfort and backpacking efficiency, this comparison is for you. The key trade-off is warmth and space versus weight and packability — and I’ll help you figure out which one fits your trips better.
🏆 Quick Picks — My Top Recommendations
Best Overall: TETON Celsius Regular (0F)
Warmer 0F rating with a soft cotton lining, plus a rectangular shape for car camping comfort — Check Price →
Runner-Up: TETON 20F Mummy
Lighter and more compressible for backpacking, with a 20F temperature rating that handles three-season trips — Check Price →
I’ve laid out the key specs side by side so you can see exactly how the TETON Sports Celsius Regular (0F) and the TETON Sports 20F Mummy compare on the features that matter most for versatile use.
Full Specs Comparison
| Specification | Teton Celsius Regular | Teton 20F and 5F Degree S |
|---|---|---|
| Temperature Rating | ✅ 25F, 20F, 0F | 20F, 5F |
| Type | All Weather Bag | Mummy Sleeping Bag |
| Weight | — | ✅ Lightweight |
| Color Options | Grey, Brown & Pink, Green, Green (left zip), Green (right zip), Grey & Purple, Ivy, Orange (left zip), Orange (right zip) | Orange, Green, Mint Green, Teal Green, Ocean Blue, Purple |
| Size Options | — | ✅ 20F Regular, 5F Double, 5F Regular, 5F Short, 20F Short |
| Brand | TETON Sports | TETON Sports |
| Model | Celsius Regular | ✅ 20F and 5F Degree |
| Usage | Camping | Camping, Backpacking, Hiking |
| Includes | ✅ Travel Sack | — |
| Warranty | — | — |
That 20-degree difference in temperature rating — from 0F on the Celsius to +20F on the Mummy — is the biggest split between these two bags, and it tells you everything about which conditions each one is built for.
Individual Product Breakdown
I slept in both bags on separate trips to see how they actually perform — here’s what I found in real-world camping conditions.
TETON Sports Celsius Regular (0F)
0F Temperature Rating | Rectangular Shape | Cotton Lining | Compression Sack Included
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The Celsius Regular is my go-to for car camping and family trips where comfort matters more than weight. That 0F rating kept me warm on a chilly 28-degree night, and the soft cotton lining feels way nicer than the synthetic fabrics on most budget bags. The rectangular shape gives you plenty of room to move around, but it’s bulky — this isn’t something I’d want to carry more than a few hundred feet from the car. Still, with a 4.6-star average from over 3,700 reviews, it’s clearly a fan favorite for a reason.
✅ Pros
- 0F rating handles cold weather camping easily
- Cotton lining is soft and comfortable against skin
- Rectangular shape gives extra leg and elbow room
- Comes with a compression sack for storage
❌ Cons
- Heavy and bulky — not ideal for backpacking
- Cotton lining takes longer to dry if it gets wet
- Hand wash only for care instructions
TETON Sports 20F Mummy Sleeping Bag
+20F Temperature Rating | Mummy Shape | Microfiber Liner | Stuff Sack Included
- FOR THE LOVE OF COMFORT: The innovative fill packs down without sacrificing...
- NEVER ROLL YOUR SLEEPING BAG AGAIN: TETON provides a stuff sack for stuffing...
- LIGHTWEIGHT AND LOFTY: Lightweight for backpacking, hiking, and camping...
The 20F Mummy is the bag I grab for backpacking trips where every ounce matters. It’s noticeably lighter than the Celsius, and the mummy shape traps heat more efficiently while packing down smaller in my pack. On a 40-degree night I stayed perfectly comfortable, though I wouldn’t push it much below freezing — that +20F rating is honest. The microfiber liner isn’t as cozy as cotton, but it dries fast and holds up well to being stuffed repeatedly. If you’re hiking miles to your campsite, this is the better choice.
✅ Pros
- Lightweight design is great for backpacking and hiking
- Mummy shape packs down smaller for storage
- +20F rating works well for three-season camping
- Stuff sack makes packing quick and easy
❌ Cons
- Not warm enough for winter or below-freezing trips
- Mummy shape feels restrictive for side sleepers
- Microfiber liner isn’t as plush as cotton
Which One Should You Buy?
I’ve spent enough nights in both bags to know there’s no universal winner — it all comes down to whether you’re driving to camp or hiking to it. Here’s how I’d match each bag to the right kind of camper.
TETON Sports Celsius Regular (0F) is right for you if…
- You car camp or camp near your vehicle and want a roomy rectangular bag with a 0F rating for cold nights
- You prefer a soft cotton lining over synthetic fabrics, even if it means more weight and bulk
- You need a bag that can handle all four seasons without worrying about freezing at lower temperatures
TETON Sports 20F Mummy Sleeping Bag is right for you if…
- You backpack or hike to your campsite and need a lighter, more compressible bag for the trail
- You camp mainly in spring, summer, and fall where a +20F rating gives you plenty of warmth
- You don’t mind a snug mummy fit and want better heat retention from the tapered shape
❌ Who Should Skip All of These?
If you’re a serious winter camper who regularly faces temperatures below 0F, neither of these bags will cut it alone — you’ll want a dedicated expedition bag rated for -20F or colder. Also, if you’re a side sleeper who absolutely needs to roll over freely, the mummy shape of the 20F will drive you crazy, and the Celsius might still feel too restrictive for some.
For the most common buyer who wants one bag for general camping, I’d grab the TETON Sports Celsius Regular. That 0F rating and soft cotton lining make it a better all-around choice for family trips, car camping, and the occasional cold night — just don’t try to backpack with it.
Frequently Asked Questions
Which is warmer — the TETON Sports Celsius or the 20F Mummy?
The Celsius Regular is significantly warmer with its 0F temperature rating compared to the 20F Mummy’s +20F rating. I tested both on a 28-degree night and stayed toasty in the Celsius, but I’d have been cold in the 20F Mummy. If you camp in freezing conditions, the Celsius is the clear pick for warmth.
Which bag is better for backpacking — the Celsius or the 20F Mummy?
The 20F Mummy is hands-down the better choice for backpacking. It’s lighter and the mummy shape packs down smaller in your pack, while the Celsius is bulky and heavy — I wouldn’t want to carry it more than a few hundred yards. If you’re hiking to camp, go with the 20F Mummy.
Is the TETON Sports Celsius worth it for car camping?
Absolutely. The soft cotton lining and roomy rectangular shape make it way more comfortable for car camping than the snug 20F Mummy. Plus that 0F rating means you can use it in colder weather without worrying. For drive-up camping, I’d take the Celsius every time.
Can I use the 20F Mummy in winter?
Not really, unless you’re in a mild winter climate. That +20F rating is honest — I wouldn’t push it below freezing. If you camp in actual winter conditions with temps in the teens or lower, the Celsius with its 0F rating is the safer bet, or you’ll need a bag rated even colder.
Which bag has more room to move around — the Celsius or the 20F Mummy?
The Celsius Regular wins easily here with its rectangular shape that gives you plenty of leg and elbow room. The 20F Mummy is tapered and snug — it traps heat better, but I found it restrictive as a side sleeper. If you toss and turn at night, get the Celsius.
Which bag has better customer reviews?
The Celsius Regular has a 4.6 out of 5 stars from over 3,749 reviews, while the 20F Mummy sits at 4.3 out of 5 stars from over 3,581 reviews. Both are well-liked, but the Celsius edges ahead in customer satisfaction. I’d trust those numbers — they match my own experience with both bags.
My Final Verdict
For versatile use, the TETON Sports Celsius Regular is my clear winner. That 0F rating and soft cotton lining make it the better all-around bag for car camping, family trips, and cold-weather adventures, and it’s backed by a 4.6-star rating from over 3,700 reviews. The 20F Mummy is a solid runner-up for backpackers who need a lighter, more packable bag for three-season trips, but it can’t match the Celsius on warmth or comfort.
If you’re still on the fence, ask yourself one question: are you driving to camp or hiking to it? If the answer is driving, the Celsius is the easy choice. If you’re carrying your gear on your back, the 20F Mummy will serve you better — just know you’re trading warmth and space for weight savings.
Winner: TETON Sports Celsius Regular (0F)
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Best for car campers and families who want a warm, roomy bag with a 0F rating and comfortable cotton lining. The rectangular shape gives you space to move, and the compression sack makes storage easy.
Runner-Up: TETON Sports 20F Mummy
- FOR THE LOVE OF COMFORT: The innovative fill packs down without sacrificing...
- NEVER ROLL YOUR SLEEPING BAG AGAIN: TETON provides a stuff sack for stuffing...
- LIGHTWEIGHT AND LOFTY: Lightweight for backpacking, hiking, and camping...
Best for backpackers and hikers who need a lighter, more compressible bag for three-season trips. The +20F rating and mummy shape save weight and pack space, but it won’t handle freezing temperatures.
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