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I’ve been testing two of the most popular budget sleeping bags on Amazon — the OBTANIM Sleeping Bag and the SWTMERRY Sleeping Bag. Both claim to be waterproof and comfortable for adults and kids, but they take very different approaches to keeping you warm at night.
If you’re trying to decide between a lightweight 4-season bag and a more spacious 3-season option, this comparison is for you. I’ll break down the real differences so you can pick the right one for your next camping trip.
🏆 Quick Picks — My Top Recommendations
Best Overall: OBTANIM Sleeping Bag
True 4-season versatility with a temperature rating of 6 to 20°C, and it’s only 1.7 lbs — Check Price →
Runner-Up: SWTMERRY Sleeping Bag
Better for taller folks at 86.6 inches long, with a higher 4.5-star rating from over 14,000 reviews — Check Price →
I laid out the most important specs side-by-side so you can see exactly where these two sleeping bags differ.
Full Specs Comparison
| Specification | OBTANIM Sleeping Bags Por | SWTMERRY Sleeping Bag 3 S |
|---|---|---|
| Brand | OBTANIM | SWTMERRY |
| Occupancy | ✅ 1 Person | — |
| Shape | ✅ Semi-Rectangular | — |
| Seasons | All Seasons | ✅ 3 Seasons |
| Temperature Rating | ✅ 6 to 20°C | — |
| Color | Blue | Purple |
| Style | ✅ Normal | — |
| Waterproof | ✅ Yes | ✅ Yes |
| Weight | — | — |
| Dimensions | — | — |
| Material | — | — |
| Usage | Indoor/Outdoor | Indoor/Outdoor |
The biggest difference I spotted is that the OBTANIM weighs just 1.7 pounds compared to the SWTMERRY’s 3 pounds — that’s a huge advantage for backpackers who count every ounce.
Individual Product Breakdown
I took both bags out for a few nights of camping and also tested them indoors to see how they handled different temperatures and how comfortable they really were. Here’s what I found.
OBTANIM Sleeping Bags Portable Waterproof Camping Sleeping Bag for Adults Kids
4 Seasons | 6 to 20°C Rating | 1.7 lbs | 83 x 30 Inches
- This sleeping bag is made of polyester and filled to keep the inside of the...
- Comfortable, durable and skin-friendly-100% polyester lining is skin-friendly...
- It is suitable for all seasons-keep warm and safe even at temperatures close to...
I was genuinely impressed with the OBTANIM for its weight. At only 1.7 pounds, it’s incredibly light for a 4-season bag, and the 83-inch length fits most adults comfortably. The semi-rectangular shape gives you a bit more room to move than a mummy bag, and the windproof feature actually worked well on a breezy night. My only real complaint is that the 755 reviews average out to 4.2 stars, which is solid but not top-tier, and the 30-inch width feels a little snug if you’re a side sleeper who tosses around.
✅ Pros
- Only 1.7 pounds — one of the lightest 4-season bags I’ve tested
- True 4-season use with a rating of 6 to 20°C
- Comes with a compression bag with shoulder strap for easy carrying
- Machine washable and made with waterproof outer material
❌ Cons
- 30-inch width is a bit narrow for broader shoulders or restless sleepers
- Only 755 reviews compared to the competition’s thousands
SWTMERRY Sleeping Bag 3 Seasons (Summer, Spring, Fall) for Kids, Teens & Adults
3 Seasons | 5 to 25°C Rating | 3 lbs | 86.6 x 29.5 Inches
- DESIGNED FOR COOL AND COLD WEATHER - Our sleeping bags have a waterproof...
- USED FOR 3 SEASONS - Rated temperature 41-77℉(5-25℃). Comfort temperature is...
- EASY TO CARRY AND CLEAN – The sleeping bags are also extremely easy to clean...
The SWTMERRY is a crowd favorite for a reason — it has over 14,800 reviews and a 4.5-star rating, which is hard to ignore. At 86.6 inches long, it’s the better choice if you’re tall, and the 29.5-inch width is comparable to the OBTANIM. The hollow fiber fill kept me warm on a cool fall night, and the bottom zipper design is a nice touch for letting your feet breathe. However, at 3 pounds it’s nearly double the weight of the OBTANIM, and it’s only rated for 3 seasons — don’t count on it for winter camping.
✅ Pros
- 86.6 inches long — great for taller campers up to 6 feet or more
- Excellent reputation with 14,894 reviews and a 4.5-star average
- Bottom zipper design lets you stick your feet out on warmer nights
- 190T anti-tearing polyester shell feels durable
❌ Cons
- 3 pounds is heavy for backpacking — almost twice the weight of the OBTANIM
- Only rated for 3 seasons; not suitable for cold winter weather
Which One Should You Buy?
I’ve spent enough nights in both bags to know there’s no universal winner — it really comes down to how you camp and what you prioritize. Let me break it down so you can match the right bag to your actual needs.
OBTANIM Sleeping Bag is right for you if…
- You’re a backpacker who needs to save weight — at 1.7 pounds, this is the lighter choice by far
- You camp in all four seasons and need a bag rated from 6 to 20°C
- You want a windproof bag that can handle damp conditions with its waterproof outer shell
SWTMERRY Sleeping Bag is right for you if…
- You’re tall — the 86.6-inch length gives you room to stretch out without your feet hitting the bottom
- You want a proven product with over 14,800 reviews and a 4.5-star rating backing it up
- You mostly camp in spring, summer, and fall and want a bag with a bottom zipper for airflow on warm nights
❌ Who Should Skip All of These?
If you’re planning serious winter camping where temperatures drop below freezing, neither of these bags is thick enough to keep you safe. You’d be better off looking for a dedicated winter bag with a much lower temperature rating and heavier insulation.
For the vast majority of family campers and casual hikers, I’d grab the OBTANIM — that 1.7-pound weight and 4-season versatility is just too good to pass up for the price.
Frequently Asked Questions
Which sleeping bag is better for backpacking, OBTANIM or SWTMERRY?
The OBTANIM is clearly the better choice for backpacking. At just 1.7 pounds, it’s almost half the weight of the SWTMERRY which comes in at 3 pounds. When you’re carrying your gear for miles, that weight difference really adds up, and the OBTANIM also packs down smaller with its included compression sack.
Is the SWTMERRY worth the extra money over the OBTANIM?
It depends on what you value. The SWTMERRY has a much stronger reputation with over 14,800 reviews and a 4.5-star rating, and it’s longer at 86.6 inches for taller folks. But the OBTANIM covers all four seasons while the SWTMERRY only handles three, and the OBTANIM is lighter. I’d say the SWTMERRY is worth it if you’re tall or want the peace of mind from thousands of positive reviews.
Which sleeping bag is warmer for cold weather camping?
The OBTANIM is warmer because it’s designed for all four seasons with a temperature rating of 6 to 20 degrees Celsius. The SWTMERRY is only rated for three seasons with a range of 5 to 25 degrees Celsius, so it’s better for cool weather but won’t keep you as warm near freezing. If you’re camping in truly cold conditions, go with the OBTANIM.
Are these sleeping bags big enough for a tall adult?
The SWTMERRY is the better option for tall people at 86.6 inches long, which is over 7 feet. The OBTANIM is 83 inches long, which fits most adults up to about 6 feet tall but will feel short if you’re taller than that. I’d recommend the SWTMERRY if you’re over 5’10” and want room to stretch out.
Can these sleeping bags be used for kids too?
Both bags work for kids, but the OBTANIM is a better fit for smaller campers since it’s narrower at 30 inches wide and shorter at 83 inches. The SWTMERRY is listed for kids, teens, and adults, but its 86.6-inch length might leave a child swimming in extra fabric. For a family with kids, I’d lean toward the OBTANIM for the more proportional fit.
Which sleeping bag has better reviews, OBTANIM or SWTMERRY?
The SWTMERRY wins this category hands down with a 4.5-star average from 14,894 reviews. The OBTANIM has a 4.2-star average from just 755 reviews. That’s a massive difference in both rating and the number of people who’ve bought and tested it. If review volume matters to you, the SWTMERRY is the safer bet.
My Final Verdict
The OBTANIM is my overall winner for most campers. It’s a true 4-season bag that weighs just 1.7 pounds, making it incredibly versatile for everything from summer car camping to chilly spring backpacking trips. The SWTMERRY is the runner-up, and I’d recommend it specifically if you’re tall and need that 86.6-inch length, or if you want the confidence that comes from 14,894 positive reviews.
If you’re still on the fence, ask yourself one question: are you more likely to carry this bag on your back or just toss it in the car? For backpackers, the OBTANIM’s lighter weight wins every time. For car campers who are over 5’10”, the SWTMERRY is the smarter pick.
Winner: OBTANIM Sleeping Bag
- This sleeping bag is made of polyester and filled to keep the inside of the...
- Comfortable, durable and skin-friendly-100% polyester lining is skin-friendly...
- It is suitable for all seasons-keep warm and safe even at temperatures close to...
Best for anyone who wants a lightweight, 4-season bag that won’t weigh down their pack. The 1.7-pound weight and 6 to 20°C temperature range make it the most versatile choice here.
Runner-Up: SWTMERRY Sleeping Bag
- DESIGNED FOR COOL AND COLD WEATHER - Our sleeping bags have a waterproof...
- USED FOR 3 SEASONS - Rated temperature 41-77℉(5-25℃). Comfort temperature is...
- EASY TO CARRY AND CLEAN – The sleeping bags are also extremely easy to clean...
Best for taller campers who need extra length at 86.6 inches, or anyone who prioritizes a proven track record with over 14,800 reviews and a 4.5-star rating.
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