Sleeping Bag Buying Guide: How to Choose the Right One for Camping
Sea to Summit Amplitude Down 25F Sleeping Bag
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Returning to the same campsite each night? You'll have a cozy bed to look forward to with the Sea to Summit Amplitude Down 25F sleeping bag. It's spacious, cozy and offers versatile ventilation.
Shop similar productsKey Details
Fill
750-fill-power duck down
Temperature Rating (F)
25 degrees (F)
- Each side of the Amplitude has a full-length side zipper; a third zipper can be found in the foot box, allowing the top section to be removed and used as a comforter
- Shaped hood and zipper draft tubes keep cold out and warmth in
- 750-fill-power duck down provides cozy warmth
- Vertical baffles over the chest prevent down shifting as you roll over in your sleep
- Includes lightweight Ultra-Silâ„¢ compression bag for easy storage and transport
- Form a snug sleeping bag for 2 by zipping to another Amplitude or Explore, Ascentâ„¢, Trekâ„¢, Traverseâ„¢, Altitudeâ„¢, Journeyâ„¢ or Ventureâ„¢ sleeping bag (not included)
Imported.
Temperature ratings are intended as a guideline to help you compare products, rather than a guarantee of warmth, since many different factors contribute to your comfort while you sleep. Backpacking bags are typically rated for temperature according to an independent testing protocol—currently International Organization for Standardization (ISO) 23537, though some older items followed European Norm (EN) 13537. Testing is based on a person wearing one base layer and a pair of socks, sleeping on an insulated surface with a minimum R-value of 5.38.
Each bag then gets 2 ratings: the Comfort rating is the lowest temperature at which the bag will keep the average "cold sleeper" comfortable, and the Lower Limit rating is the lowest temperature at which the bag will keep the average "warm sleeper" comfortable. Some brands determine their own temperature rating by aligning to the Comfort rating for women’s bags, to the Lower Limit rating for men’s bags, or somewhere in the middle for nongendered bags.
View all Sea to Summit Camping Sleeping BagsEach bag then gets 2 ratings: the Comfort rating is the lowest temperature at which the bag will keep the average "cold sleeper" comfortable, and the Lower Limit rating is the lowest temperature at which the bag will keep the average "warm sleeper" comfortable. Some brands determine their own temperature rating by aligning to the Comfort rating for women’s bags, to the Lower Limit rating for men’s bags, or somewhere in the middle for nongendered bags.
| Best Use | Camping |
|---|---|
| Tested Lower Limit | 25 degrees (F) - EN |
| Tested Comfort | 37 degrees (F) - EN |
| Temperature Rating (F) | 25 degrees (F) |
| Temperature Rating (C) | -4 degrees (C) |
| Shell | Nylon |
| Zipper Location | Left/Right |
| Insulation Type | Down |
| Water-Resistant Down | Yes |
| Fill | 750-fill-power duck down |
| Lining | 20-denier nylon |
| Sleeping Bag Shape | Rectangular |
| Stuff Sack Size | 7 x 16 inches |
| Stuff Sack Volume | 10 liters |
| Gender | Unisex |
Buying Advice
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Customer Images
Andrew
Sleeping bag? Sleeping room!
3 years ago
I am a warm, side sleeper and therefore tend to get claustrophobic in most sleeping bags. I've tried rectangular bags and also the Nemo spoon bags, but this is by far the most comfortable and roomiest sleeping bag I've ever slept in. If you run cold, I can see the access space possibly being an issue on really cold nights, but that can be solved with some base layers and socks. It also doesn't pack down super small, but this is not a bag for ultra-light backpackers anyway. Perks: - There is just so much room to roll around and bend my elbow and knees in. - Side zippers can turn the bag into a quilt. Footbox zipper can be opened to regulate heat. -
Yes , I recommend this product
Allan I.
a sleeping bag for all three bears!
3 years ago
I am a side sleeper and am restless with tossing and turning through the night. I'm also claustrophobic and mummy bags with one zipper often times ends up under me with no way to escape. i spent two months researching the perfect bag. this bag is so roomy, i can nearly do cartwheels inside it. having zippers on both sides with foot box venting is genius. the last sleeping bag I'll ever purchase. the last thing anyone wants after a long day on the river is a bad night 's sleep. this sleeping bag changed all that. extremely satisfied and big time impressed with this bag and feeling proud of making a sound purchasing decision.
Originally posted on Sea to Summit
Jeff T.
Tested and passed
2 years ago
[This review was collected as part of a promotion.] Had this bag in 18° weather with the Reactor Extreme Liner (adds up to 25°F) Was comfortable with the temperature and the room in the bag is fantastic. I did a test might in that garage so as not to freeze in the woods without a way out. I am convinced it will handle the actual temp rating.
Originally posted on Sea to Summit
John
Favorite camp bag
3 years ago
I own the first iteration of this bag from a few years ago. I move around a lot in my sleep and the narrowness of sleeping bags has always disrupted my sleep a bit (which is a big deal for me because I spend many, many weeks out every year). For camping that doesn't involve the need for ultra light travel, this is my favorite 3-season bag I have ever owned. Warm, high quality down, with room to comfortably move around. Plus, when it gets a little warm, the full bag zipper allows me to open the bag and use it as a quilt.
Originally posted on Sea to Summit
Warren
Quality Sleeping Bag!
3 years ago
I used this bag on a road trip in December with my girlfriend and we loved it! we paired it with a sleeping pad(that was firmly secured to the bag with some sweet straps so the pad didn't end up all wonky) and stayed plenty warm! the colder nights were 20-25 °F and the warmer nights were up to 35-40 °F. it is very light and can compact down smaller than my single big Agnes 0 degree bag but still very warm and cozy. I am 6'3 and my girlfriend is 5' 5 and there was no shortage of space. We took a road trip from Central CA to the Mojave then down to Sedona. Spent a few nights outside of Flagstaff and hiked to the Indian Gardens (campground in the Ground Canyon!) for two nights to Home. The trip took us a little over a week and I couldn't be happier with my choice in this sleeping bag.
Originally posted on Sea to Summit
Clarissa
California
Incredibly roomy
3 years ago
Incredibly roomy and spacious. If you’re a bigger girl or you appreciate the ability to move around in your sleep, this one is for you. It’s also surprisingly compact and light weight - the compression sack will make it easy to shove into your backpack. As a bonus, the hood cinches down to keep your nose and forehead warm in the cold.
Age:25–34
Weight:250–275 lbs.
Height:5'6"
Yes , I recommend this product
Michael K.
Hot summer Nights
2 years ago
[This review was collected as part of a promotion.] Even though it’s 90 degrees out this bag is light and roomy. Can’t wait for the cold nights to come to really put it to the test. For being one of the biggest bags it packed really well. The zipper pulls smoothly with no hang ups. The pack bag is nice; however, getting a compression bag.
Originally posted on Sea to Summit
Charles H.
Excellent mid-fall backcountry mountain bag!
2 years ago
[This review was collected as part of a promotion.] Excellent mid-fall backcountry mountain bag! Never felt confined, the wide top/ shoulder design was so comfortable and zipper on both sides allowed options. Plus never got cold once, even when the wood stove went out!
Originally posted on Sea to Summit
Denise M.
Love this bag! It was
2 years ago
[This review was collected as part of a promotion.] Love this bag! It was roomy enough for a side sleeper and someone who doesn’t like constricting mummy bags. It also kept me warm when the temps dropped - even with the extra room.
Originally posted on Sea to Summit
Henry R.
I got cold with temps
2 years ago
[This review was collected as part of a promotion.] I got cold with temps at 30 degrees. I love everything else about the bag but it is just not warm. It’s supposed to be a 5 degree bag but it’s not even close.
Originally posted on Sea to Summit
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