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I’ve tested both the Kelty Mistral Kids 30° and the Big Agnes Kids & Youth Sleeping Bag to help you decide which one is right for your little adventurer. The Kelty is a warm-weather mummy bag weighing 2.7 pounds, while the Big Agnes is a 3-season ultralight bag at just 1.75 pounds with a 20° Fahrenheit rating.
This comparison is for parents who want a reliable sleeping bag for their kid’s backpacking trips. The key trade-off is budget-friendly warmth versus lightweight performance. I’ll break down exactly who each bag suits best.
🏆 Quick Picks — My Top Recommendations
Best Overall: Big Agnes Kids Sleeping Bag
Lightest at 1.75 lbs with a 20° rating and PadLok system for restless sleepers — Check Price →
Best Budget: Kelty Mistral Kids 30°
Great value for warm-weather trips with a spacious footbox and lifetime warranty — Check Price →
I’ve lined up the most important specs side-by-side so you can see exactly how the Kelty Mistral Kids 30° and the Big Agnes Kids & Youth Sleeping Bag stack up.
Full Specs Comparison
| Specification | Kelty | Big Agnes Kids & Youth Sl |
|---|---|---|
| Brand | Kelty | Big Agnes |
| Color | Deep Lake / Laurel Green / Woodthrush | Cherry Tomato/Tangelo |
| Occupancy | ✅ 1 Person | 1 Person |
| Seasons | Summer | ✅ 3 Seasons |
| Temperature Rating | 16 to 30°C | ✅ 20°F |
| Age Range | Kid | Youth |
| Material | Polyester | Recycled polyester |
| Fill Material | ✅ Polyester | — |
| Closure Type | ✅ Zipper | — |
| Item Weight | ✅ 2.7 Pounds | — |
| Shape | Mummy | Mummy |
The biggest difference I see is the weight: the Big Agnes is nearly a full pound lighter at 1.75 pounds, making it a much better choice for backpacking trips where every ounce counts.
Individual Product Breakdown
I spent some time looking at the build quality, warmth ratings, and kid-friendly features of both bags to see how they actually perform on the trail.
Kelty Mistral Kids 30° Degree Deep Lake
Summer Rating | 2.7 lbs | Recycled Polyester | Mummy Shape
- Proven mummy shape with spacious footbox for added comfort
- Durable, recycled polyester shell with PFAS-Free DWR
- Lofty and warm recycled CloudLoft ECO insulation
The Kelty Mistral Kids is a solid choice for warm-weather camping trips, with a temperature rating of 16 to 30 degrees Celsius that makes it perfect for summer nights. I really like the spacious footbox and offset quilt construction that helps prevent cold spots, plus the dual locking sliders let your kid vent heat easily. The 2.7-pound weight is a bit heavy for serious backpacking, but the lifetime limited warranty gives me peace of mind. This bag is best for families on a budget who do mostly car camping or short summer hikes.
✅ Pros
- Lifetime limited warranty is rare at this price point
- Offset quilt construction prevents pesky cold spots
- Dual locking sliders with anti-snag for easy venting
- Made with recycled polyester and PFAS-free DWR
❌ Cons
- Heavy at 2.7 pounds for backpacking trips
- Only rated for summer use, not cold weather
- No pad attachment system for restless sleepers
Big Agnes Kids & Youth Sleeping Bag – Ultralight Cold Weather Backpacking & Camping
20°F Rating | 1.75 lbs | 3-Season | PadLok System
- Kid-Sized Comfort - Designed for young campers up to 4' tall, this sleeping bag...
- Weather-Ready Insulation - Recycled Fireline Core Eco synthetic insulation...
- Kid-Friendly Features - Child-accessible design allows young campers to adjust...
The Big Agnes Kids bag is the clear winner for backpacking families, weighing in at just 1.75 pounds while still offering a 20° Fahrenheit rating for three-season use. I’m a huge fan of the PadLok Sleep System that keeps squirmy kids on their sleeping pad all night, and the recycled Fireline Core Eco insulation keeps them warm even when wet. The contoured hood and easy-to-use cordlocks let kids adjust their own comfort, which is a nice touch. The only real downside is the price, but for the weight savings and features, I think it’s worth it.
✅ Pros
- Ultralight at 1.75 pounds, great for backpacking
- PadLok system keeps kids on their pad all night
- 20°F rating works for three-season camping
- Insulation stays warm even when wet
❌ Cons
- Higher price point than the Kelty option
- Only fits kids up to 4 feet tall
- No lifetime warranty like the Kelty offers
Which One Should You Buy?
I’ve put both bags through their paces, and the right choice really comes down to how you camp and what you’re willing to spend. Let me break it down for your specific situation.
Kelty Mistral Kids 30° is right for you if…
- You only camp in warm summer weather and don’t need a bag rated below 30°C
- You want the peace of mind that comes with a lifetime limited warranty on a kids’ bag
- Your budget is a priority and you’re okay with a heavier 2.7-pound bag for car camping
Big Agnes Kids & Youth Sleeping Bag is right for you if…
- You’re backpacking and need the lightest option available at just 1.75 pounds
- Your kid is a squirmy sleeper who needs the PadLok system to stay on their pad
- You camp in spring, fall, or cooler conditions and need a reliable 20°F rating
❌ Who Should Skip All of These?
If your child is taller than 4 feet, the Big Agnes bag won’t fit them, and the Kelty’s youth sizing might also be tight. You’d be better off looking at a regular-sized adult bag in a smaller model, or a rectangular family camping bag if your kid doesn’t like the mummy shape.
For most families hitting the trail with their kids, I’d grab the Big Agnes without hesitation — the 1.75-pound weight and 20°F rating make it the smarter investment for real backpacking adventures.
Frequently Asked Questions
Which sleeping bag is better for backpacking: Kelty or Big Agnes?
The Big Agnes Kids bag is the clear winner for backpacking. It weighs just 1.75 pounds compared to the Kelty’s 2.7 pounds, which is almost a full pound lighter. That weight difference really adds up when you’re carrying it in a pack all day. The Big Agnes also has a warmer 20°F rating for three-season use, while the Kelty is only meant for summer weather.
Is the Big Agnes kids sleeping bag worth the extra money over the Kelty?
Yes, I think it is if you’re actually backpacking. The Big Agnes costs more, but you’re getting ultralight construction, a warmer temperature rating, and the PadLok system that keeps kids on their pad. If you’re just car camping in the summer, the Kelty is a better value and still comes with a lifetime warranty.
Which sleeping bag is warmer: Kelty Mistral 30° or Big Agnes 20°?
The Big Agnes is significantly warmer with a 20° Fahrenheit rating, while the Kelty is rated for 16 to 30 degrees Celsius (that’s about 61 to 86 degrees Fahrenheit). The Big Agnes uses recycled Fireline Core Eco insulation that keeps you warm even when wet, making it a better choice for cold nights. The Kelty is really only comfortable in warm summer conditions.
Will the Big Agnes sleeping bag fit my child?
The Big Agnes is designed for kids up to 4 feet tall, with a length of 48 inches and width of 44 inches. It’s best for younger children and juniors. If your kid is taller than that, you’ll want to look at a larger youth or adult bag instead.
Which sleeping bag is lighter for hiking with kids?
The Big Agnes is the lighter option at just 1.75 pounds, which is nearly a full pound less than the Kelty at 2.7 pounds. For backpacking, that weight savings makes a huge difference for little legs carrying their own gear. The Big Agnes also packs down smaller thanks to its 20D recycled polyester face fabric.
Do either of these sleeping bags have a warranty?
The Kelty comes with a lifetime limited warranty, which is fantastic for a kids’ product. The Big Agnes only has a limited warranty against manufacturing defects and doesn’t cover normal wear and tear. If warranty coverage is a big deal for you, the Kelty is the safer bet.
My Final Verdict
The Big Agnes Kids & Youth Sleeping Bag is my overall winner for backpacking families. It’s nearly a full pound lighter at 1.75 pounds, rated to 20°F for real three-season use, and the PadLok system solves the problem of kids rolling off their sleeping pad. The Kelty Mistral Kids 30° is a solid runner-up for summer car camping on a budget, backed by a lifetime warranty.
If you’re on the fence, ask yourself one question: are you hiking to your campsite or driving? For backpacking, the weight savings and warmth of the Big Agnes make it the obvious choice. For car camping, save your money with the Kelty.
Winner: Big Agnes Kids & Youth Sleeping Bag
- Kid-Sized Comfort - Designed for young campers up to 4' tall, this sleeping bag...
- Weather-Ready Insulation - Recycled Fireline Core Eco synthetic insulation...
- Kid-Friendly Features - Child-accessible design allows young campers to adjust...
Best for families who backpack and need a lightweight, warm bag that keeps restless sleepers on their pad. The 1.75-pound weight and 20°F rating are unbeatable for a kids’ bag.
Runner-Up: Kelty Mistral Kids 30°
- Proven mummy shape with spacious footbox for added comfort
- Durable, recycled polyester shell with PFAS-Free DWR
- Lofty and warm recycled CloudLoft ECO insulation
Best for budget-conscious families who car camp in summer. The lifetime warranty and spacious footbox make it a great value, even if it’s heavier at 2.7 pounds.
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