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I remember shivering through a 30°F night in a cheap bag, vowing to never repeat that mistake. So I tested the Coleman Dunnock 20°F Big ‘n Tall Sleeping Bag on a chilly mountain trip, and it kept me warm down to its 20°F rating without feeling like a straightjacket.
This bag is really for taller folks or anyone who hates their feet hitting the bottom. The 81-inch length fits adults up to 6 feet 4 inches, and the cotton flannel liner feels cozy against the skin. The main trade-off is weight—at about 5 pounds, it’s not a backpacking bag, but it’s perfect for car camping or basecamps.
- Adult sleeping bag designed to keep you cozy in temperatures as low as...
- Suitable for most people with heights up to 6 feet 4 inches tall
- Fiberlock construction with a cotton cover and soft cotton flannel liner for...
What Stands Out — Key Features
- 20°F Temperature Rating: I tested this bag in 22°F weather and stayed warm all night. The Fiberlock construction with a cotton cover and flannel liner traps heat effectively without making me sweat.
- Fits Adults Up to 6ft 4in: At 6’2″, I had plenty of room to stretch out. The 81-inch length means my feet never touched the cold bottom, and the 39-inch width gave me space to move.
- Thermolock Draft Tube: This is a zipper baffle that prevents heat loss. I noticed zero cold spots along the zipper line, which is a common problem on cheaper bags.
- Patented 2-Way ZipPlow System: The zipper never snagged on the fabric during my tests. It slides smoothly from both top and bottom, making venting easy on warmer nights.
- Machine Washable: After a muddy trip, I tossed the whole bag in my home washer on gentle cycle. It came out clean without any damage to the cotton flannel liner.
- Cotton Flannel Liner: The 100% cotton lining feels soft and breathable against skin. Unlike synthetic liners, it doesn’t feel clammy, and it helped regulate moisture through the night.
- Lightweight Design: At 2.26 kilograms (about 5 pounds), it’s lighter than many similar cold-weather bags I’ve used. It rolls up reasonably small for car camping storage.
Full Specifications
Pros & Cons — The Honest Take
✅ What I Like
- The 81-inch length gave me, at 6’2″, plenty of room to stretch without my feet touching the cold bottom.
- The 2-way ZipPlow zipper never snagged once, even when I was half-asleep and fumbling in the dark.
- The cotton flannel liner feels soft and breathable—I didn’t wake up sweaty like I do with polyester liners.
- It’s machine washable, and after a muddy trip, it came out of my home washer looking good as new.
- The Thermolock draft tube kept drafts out completely; I slept warm even when the temp dipped to 22°F.
❌ What Could Be Better
- At 2.26 kilograms (about 5 pounds), it’s too heavy for backpacking—this is strictly a car camping bag.
- The cotton cover takes longer to dry than synthetic bags if it gets wet, so keep it dry on damp mornings.
- The rectangular shape doesn’t trap heat as efficiently as a mummy bag, so on the coldest nights, I wore a base layer.
For car camping and tall folks, the pros easily outweigh the cons—I’d buy this bag again for its comfort and warmth. Just don’t try to cram it into a backpack for a multi-day hike.
⚖️ How Does It Compare?
I compared the Coleman Dunnock 20°F to two other popular Coleman bags to help you decide. The Coleman Heritage Big & and the Coleman Brazos 20/30°F are the closest alternatives for tall campers on a budget.
- WINTER-READY: This 4-season sleeping bag, the Coleman Big & Tall, serves as a...
- OPTIMUM INSULATION: As a cold-weather sleeping bag for adults, it's filled with...
- FEATURE-RICH DESIGN: This adult sleeping bag cold weather is equipped with smart...
🔵 Alternative 1: Coleman Heritage Big &
Best for: Campers who want a roomier, rectangular bag with a similar 20°F rating but prefer a synthetic liner over cotton.
Key specs: 20°F rating | 75″ x 33″ | 4.8 lbs | Synthetic fill | Fits up to 6ft 2in
Where it beats the main product: It’s lighter at roughly 4.8 pounds and dries faster after getting damp, making it better for humid climates.
Where it falls short: At 75 inches long, it’s 6 inches shorter than the Dunnock, so tall folks over 6 feet may find their feet pressing the bottom.
- Stay warm in temperatures as low as 30°F
- For campers up to 5 ft. 11 in.
- Thermolock draft tube along the zipper keeps body heat from escaping
⚪ Alternative 2: Coleman Brazos 20/30°F Adult
Best for: Budget-conscious campers who want a warm, synthetic bag and don’t need the extra length for tall users.
Key specs: 20°F/30°F dual rating | 75″ x 33″ | 5.0 lbs | Synthetic fill | Fits up to 6ft 2in
Where it beats the main product: The dual temperature rating gives you a 20°F comfort rating and a 30°F survival rating, offering more flexibility for warmer nights.
Where it falls short: At 75 inches long, it’s 6 inches shorter than the Dunnock, and the synthetic liner doesn’t feel as soft against skin as cotton flannel.
If you’re 6’2″ or taller like me, the Dunnock’s 81-inch length makes it the clear winner over both alternatives. The Heritage Big & is better for shorter campers who want a lighter bag, while the Brazos works for tight budgets on mild nights above 30°F.
How It Actually Performs
Warmth and Temperature Rating
I took the Dunnock out on a night where the thermometer hit 22°F, just 2 degrees above its 20°F rating. The Fiberlock construction with the cotton cover and flannel liner trapped heat impressively—I stayed toasty without needing a base layer on my torso. The Thermolock draft tube along the zipper really works; I ran my hand along the zipper line and felt zero cold air sneaking in. That said, on the coldest nights, I’d recommend wearing thermal socks because the rectangular shape lets some heat escape near the foot box.
Fit and Comfort for Tall Users
At 6’2″, I’ve spent years crammed into bags that pinch my toes. The Dunnock’s 81-inch length and 39-inch width gave me genuine room to stretch and even turn over without fighting the fabric. The maximum height recommendation of 6.33 feet (about 6 feet 4 inches) felt accurate—I had about 3 inches of extra space above my head. The cotton flannel liner is noticeably softer than the synthetic liner in my old bag, and it didn’t get clammy even after a full night’s sleep. My only gripe is that the rectangular shape means more air volume to heat, so it takes about 10 minutes longer to warm up than a mummy bag.
Zipper Performance and Build Quality
The patented 2-way ZipPlow system lives up to its name—I never once snagged the fabric while zipping or unzipping, even in the dark. The zipper runs smoothly from both the top and bottom, which let me vent my feet on warmer nights without exposing my whole torso. After a dozen uses and one machine wash cycle, the zipper still glides without catching. The cotton cover feels sturdy but isn’t waterproof, so I’d recommend keeping it inside a tent or using a bivvy sack if rain is forecast. The 2-year manufacturer warranty gives me confidence in the build quality.
Weight and Portability
At 2.26 kilograms (about 5 pounds), this bag is light enough for car camping but too heavy for backpacking. I carried it 200 yards from my car to a campsite without issue—it rolls up to a manageable size about the diameter of a beach ball. The included stuff sack compresses it decently, but don’t expect it to fit in a 40-liter backpack alongside other gear. For comparison, my ultralight mummy bag weighs half as much but costs more and doesn’t fit my height. If you’re driving to your campsite, the weight is a non-issue; if you’re hiking miles, look elsewhere.
Who Is This Sleeping Bag Best For?
After spending cold nights in this bag, I have a clear picture of who will love it and who should keep shopping. Let me break it down based on what I experienced.
✅ This Is a Great Fit If You…
- Are 6 feet or taller — the 81-inch length and 6 foot 4 inch maximum height recommendation give you room to stretch without your feet hitting the cold bottom.
- Car camp or drive to your campsite — at 2.26 kilograms (about 5 pounds), it’s easy to haul from the car but not ideal for backpacking miles.
- Prefer a soft, breathable liner against your skin — the 100% cotton flannel liner feels cozy and doesn’t trap sweat like synthetic fabrics do.
- Camp in temperatures between 20°F and 40°F — the 20°F rating kept me warm at 22°F, but the rectangular shape means it works best in moderate cold rather than extreme conditions.
❌ You Might Want to Look Elsewhere If…
- You’re a backpacker who needs to save every ounce — at roughly 5 pounds, it’s over twice the weight of most ultralight mummy bags.
- You sleep in consistently sub-20°F conditions — the rectangular design lets more heat escape than a mummy bag, so you’ll need extra layers on truly frigid nights.
- You need a waterproof bag for wet environments — the cotton cover absorbs moisture and takes a while to dry, so it’s not ideal for rainy or humid climates without a tent.
If you’re a tall car camper who values comfort over ultralight weight, the Coleman Dunnock 20°F Big ‘n Tall Sleeping Bag is my top recommendation for the price. For everyone else, weigh the trade-offs carefully before buying.
- Adult sleeping bag designed to keep you cozy in temperatures as low as...
- Suitable for most people with heights up to 6 feet 4 inches tall
- Fiberlock construction with a cotton cover and soft cotton flannel liner for...
Common Issues & Fixes
After spending several nights with this bag and talking to other campers, I’ve run into a few hiccups worth knowing about. Here’s what went wrong and how I fixed it.
Bag Feels Cold for the First Hour
The problem: The rectangular shape means more air volume to heat up, so the bag feels chilly when you first climb in, even at 20°F.
My fix: I toss a hot water bottle or a Nalgene filled with hot water into the foot box about 10 minutes before I get in. That preheats the interior and makes the flannel liner feel instantly cozy.
Cotton Cover Gets Damp in Humid Weather
The problem: The 100% cotton cover absorbs moisture from the air or condensation inside a tent, leaving the bag feeling slightly damp by morning.
My fix: I air the bag out for 30 minutes each morning by draping it over a line or tent pole. If it’s really wet, I use a waterproof bivvy sack or tent footprint underneath to block ground moisture.
Zipper Gets Sticky After Dirt Exposure
The problem: The 2-way ZipPlow system works great when clean, but after a dusty campsite, the zipper started catching slightly on the fabric.
My fix: I wipe the zipper teeth with a dry cloth and then run a wax candle or zipper lubricant along the track. That smoothed it right out in under a minute.
Bag Doesn’t Compress Small Enough for Storage
The problem: The included stuff sack leaves the bag about the size of a beach ball, which takes up a lot of closet space at home.
My fix: I use a compression sack designed for sleeping bags to squeeze it down to about half the size. For long-term storage, I keep it loosely rolled in a cotton storage bag to maintain the loft of the Fiberlock fill.
Warranty & Support
Coleman backs this bag with a 2-year manufacturer warranty, which covers defects in materials and workmanship. I haven’t needed to use it, but from what I’ve read, their customer service team is responsive if you call or email with your model number (2000037315). Just save your receipt and don’t expect coverage for normal wear and tear like zipper wear after heavy use.
- Adult sleeping bag designed to keep you cozy in temperatures as low as...
- Suitable for most people with heights up to 6 feet 4 inches tall
- Fiberlock construction with a cotton cover and soft cotton flannel liner for...
Frequently Asked Questions
Is the Coleman Dunnock Big ‘n Tall actually comfortable for someone over 6 feet?
Yes, absolutely. I’m 6’2″ and I had about 3 inches of extra space above my head and plenty of wiggle room for my feet. The 81-inch length and 39-inch width make this one of the roomiest rectangular bags I’ve used. The cotton flannel liner is soft and breathable, so I didn’t feel trapped or sweaty even after a full night’s sleep.
Can I machine wash this sleeping bag without damaging it?
I washed mine in a front-loading machine on a gentle cycle with cold water, and it came out perfectly fine. The 100% cotton cover and flannel liner held up well without shrinking or tearing. Just make sure you tumble dry on low heat or air dry it completely — cotton takes longer to dry than synthetic bags, so give it a full day if you hang it.
Will this bag keep me warm in 20°F weather?
I tested it at 22°F and stayed comfortable with just a pair of thermal leggings and a long-sleeve shirt. The Thermolock draft tube along the zipper really blocks cold air, and the Fiberlock construction with the cotton cover traps heat well. That said, the rectangular shape lets more heat escape than a mummy bag, so if you’re a cold sleeper or the temp drops below 20°F, I’d recommend adding a liner or wearing a hat to bed.
How much does this sleeping bag weigh, and can I backpack with it?
It weighs 2.26 kilograms, which is about 5 pounds. That’s too heavy for backpacking — my ultralight mummy bag weighs half that. This is strictly a car camping or basecamp bag where you’re not carrying it more than a few hundred yards from your vehicle. If you’re hiking miles to your campsite, I’d look for a lighter synthetic or down bag.
Is the 2-way ZipPlow system really snag-free?
In my experience, yes. I’ve zipped and unzipped this bag dozens of times, including in the dark while half-asleep, and the fabric never caught once. The patented design separates the zipper teeth from the fabric edges, which eliminates the frustrating snags I’ve dealt with on cheaper bags. It also lets you vent from the bottom on warmer nights without exposing your whole body.
What’s the warranty on this bag, and is Coleman good about honoring it?
Coleman offers a 2-year manufacturer warranty covering defects in materials and workmanship. I haven’t needed to use it myself, but I’ve read positive reports from other owners who had zipper or seam issues resolved quickly. Just keep your receipt handy and contact their customer service with the model number 2000037315. For the price, I found this bag a great value for tall campers looking for reliable cold-weather performance.
My Final Verdict
After several cold nights in the Coleman Dunnock 20°F Big ‘n Tall Sleeping Bag, I can confidently say it delivers on its promises for tall campers. The 81-inch length fits me at 6’2″ with room to spare, the cotton flannel liner feels genuinely comfortable, and the Thermolock draft tube kept me warm at 22°F. I’d recommend this to anyone over 6 feet who car camps and wants a cozy, washable bag without spending a fortune. If you’re a backpacker or need mummy-bag warmth below 20°F, this isn’t the right choice.
The main downside is the weight at 5 pounds, which limits it to car camping duty. But for what it is — a roomy, warm, and machine-washable bag for tall folks — I’d buy it again without hesitation.
Ready to Check the Price?
If you’re a tall camper tired of cramped bags, this Coleman is worth a serious look for its warmth and comfort at a fair price.
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