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Sea To Summit
Altitude AtI Sleeping Bag: 25F Down - Women's

4.884615384615385 out of 5 stars
26 Reviews

Out of Stock

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Altitude AtI Sleeping Bag: 25F Down

When you’re out on a deep-wilderness backpacking excursion it's important to have a sleeping arrangement that balances warmth and lightweight efficiency. The Altitude 25 Sleeping Bag weighs in at under three pounds to keep you moving swiftly on the trail, while a Thermolite insulated foot section instantly warms your feet on cool nights.


Details

  • Down sleeping bag is intended for backpacking in spring and summer months
  • Mummy shape uses a snug fit to reduce dead space for thermal efficiency
  • Shaped hood and oversized draft collar supply options for increased warmth
  • Lightweight compression bag and storage cell pack the bag down for transport
  • Zip the Altitude bag in with an Ascent or Traverse bag to form a double bag
  • Item #STS006Q
Material
20D nylon
Insulation
750+ fill RDS Ultra-Dry Down (water-resistant), Thermolite (footbox)
Shape
mummy
Zipper
full-length
Max User Height
[regular] 5ft 7in, [long] 6ft
Shoulder Circumference
[regular] 58in, [long] 60in
Hip Circumference
[regular] 58in, [long] 60in
Foot Circumference
[regular] 46in, [long] 48in
Bag Length
78.35in
Draft Tube
yes
Pockets
[internal] 1 phone/GPS/valuables
Pad Retainer
none
Fill Weight
[regular] 1lb 2.3oz, [long] 1lb 4.5oz
Degree
25F
Stuff Sack
Ultra-Sil compression bag
Stuff Size
[regular] 6.5L, [long] 8.3L
Claimed Weight
[regular] 2lb 6oz, [long] 2lb 9.3oz
Activity
backpacking, weekend camping
Manufacturer Warranty
lifetime

Overall Rating

5 based on 26 ratings

Review Summary

1 Stars - 0 reviews
2 Stars - 0 reviews
3 Stars - 0 reviews
4 Stars - 3 reviews
5 Stars - 23 reviews

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5 out of 5 stars

February 22, 2024

Cozy and warm

[This review was collected as part of a promotion.] This is by far the best sleeping bag I’ve owned. I used it in 40 degree weather and was warm, even though I tend to be cold normally. I love how small it packs down and it’s ultra light. Great investment for sure.

Shannon J.
Sea to Summit

Originally reviewed on Sea to Summit

5 out of 5 stars

January 6, 2024

Awesome bag

[This review was collected as part of a promotion.] I love this bag. We zip it with the Avent bag and love it!

Lauren D.
Sea to Summit

Originally reviewed on Sea to Summit

5 out of 5 stars

January 3, 2024

This bag is so cozy

[This review was collected as part of a promotion.] This bag is so cozy and the color is beautiful. The zippers on both sides are such a great thing for me as I typically sleep facing the opposite side the zippers are on other bags and my dog crawls in to sleep inside with me. There’s plenty of room for her to do that with this bag also. We took it on our first adventure backpacking to a fire tower overnight and it was plenty warm in the 20s with my liner, wearing just a base layer. I can’t wait to take it on more adventures when the weather warms up and see how it holds up but I’m already very happy with the purchase!

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Kayla K.
Sea to Summit

Originally reviewed on Sea to Summit

5 out of 5 stars

December 29, 2023

Pretty good

[This review was collected as part of a promotion.] The sleeping bag is made well, very comfy feels cozy, and not noisy. The width was great and not too snug sleeping in undergarments but would have been crowded with heavy sleepwear. I wish I would’ve ordered a longer and colder bag. Sleeping Id roll further into the bag and the foot box was cramped lengthwise (im 5’6”). I did not attempt to use the bag solo nor would I because it was so cold, icy, & damp. I used a liner (game changer!) and a secondary sleeping bag unzipped on top as a blanket.

Blake M.
Sea to Summit

Originally reviewed on Sea to Summit

5 out of 5 stars

November 22, 2023

Altitude Women's Down Sleeping Bag 15°F

Wow, I went from a summer flannel sleeping bag that I would freeze in to a cascade of down comfort comparable to nothing you could possibly imagine. I'm is awe as a first time user. It takes a while to wrap your head around the price, but once you jump in, there is no turning back. I highly recommend! I also purchased a liner that can be used alone or with the down bag.

Pattie
Sea to Summit

Originally reviewed on Sea to Summit

5 out of 5 stars

October 31, 2023

Warm and cozy

I love this sleeping bag! I recently took it on a canoe trip in Wisconsin over a very cold last weekend in October and It kept me warm all night. I also love the features that allow you to unzip the feet and sides that makes it also very usable on warm nights in the summer.

Alex P.
Sea to Summit

Originally reviewed on Sea to Summit

5 out of 5 stars

September 7, 2023

Obsessed!

[This review was collected as part of a promotion.] This sleeping bag is truly my holy grail! It’s comfortable, versatile, warm, and beautiful! I’m a side sleeper who tosses and turns a lot and this bag didn’t make me feel constricted at all. My feet also tend to get warm so I really liked the zipper just for the end of the bag. Highly recommend!

Cassie L.
Sea to Summit

Originally reviewed on Sea to Summit

5 out of 5 stars

May 11, 2023

Couldn't Love More

I'm a HUGE fan of this sleeping bag - as someone who spent years shivering through the night in old/inefficient sleeping bags, the women's specific body mapping of this bag made all the difference! The length/shape of the bag means no "dead space" (where air could stay cold), which is impressive given its not a mummy bag - there is room to sprawl a bit more. While there is extra warmth in the toes, and extra warmth around the chest (with keeps cold air from getting in), simultaneously this bag has all of the zippers you could need to ventilate on warmer summer nights (bottom of bag, both sides to make it more duvet style). The quality of the down/material itself is really nice - super soft and lofty. The bag still bags down incredibly small and lightweight as needed. Genuinely don't have any critiques of this bag and would highly recommend. For reference - I'm 5'4'', and my toes don't touch the bottom of this bag but I can stay plenty warm. 125lbs, and plenty of room to wear several layers if wanted and still be able to move around.

Natalie
Sea to Summit

Originally reviewed on Sea to Summit

5 out of 5 stars

April 19, 2023

10/10 sleeping bag

[This review was collected as part of a promotion.] This is the best purchase I’ve made. I go backpacking often and having a quality sleeping bag makes a huge difference for comfort and light weight carrying. I would recommend this sleeping bag to anyone.

Natalie W.
Sea to Summit

Originally reviewed on Sea to Summit

4 out of 5 stars

March 9, 2023

I got my sleeping bag,

[This review was collected as part of a promotion.] I got my sleeping bag, and I’m super excited to try it. I love that it comes with both a compression sack and a storage bag. I wish the inner pocket for the phone was a little larger as my phone doesn’t quite fit.

Rachel K.
Sea to Summit

Originally reviewed on Sea to Summit