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Ascent 900 Sleeping Bag: 0F Down

5 out of 5 stars
5 Reviews
Color:Oxblood Red



Why We Like The Ascent 900 Sleeping Bag

After taking a beating from the mountain, we sink inside the Ascent 900. This sleeping bag's wide mummy shape and angled foot box allow room for comfort, while the lofty fill traps in our heat and the treated fibers block out moisture, helping us find deep, restorative slumber.


  • Toasty sleeping bag for treacherous backcountry pursuits
  • Light, durable material resists moisture and blocks winds
  • Compressible down fill provides warmth without heft or bulk
  • Trapezoidal boxwall baffle construction eliminates cold spots
  • 3D collar blocks out drafts to increase heat retention
  • Internal stash pocket keeps your headlamp nearby
  • Stuff sack included for compact stashing
  • Item #RABZ0HA
[face fabric] 30D recycled Pertex Quantum (nylon), fluorocarbon-free DWR finish, [lining] 20D recycled nylon
650-fill RDS-certified European duck down, Nikwax fluorocarbon-free hydrophobic finish
wide mummy
Max User Height
[regular] 72.8in, [long] 78.7in
Shoulder Circumference
[regular] 63in, [long] 63.8in
Hip Circumference
[regular] 52.8in, [long] 53.5in
Foot Circumference
[regular] 42.5in, [long] 43.3in
Bag Length
[regular] 84.6in, [long] 90.6in
Draft Tube
3D collar
1 zippered internal
Pad Retainer
Fill Weight
European Norm/ISO Lower Limit Rating
Storage Sack
cotton, water-resistant base
Stuff Sack
Stuff Size
17.7 x 9.4in
Claimed Weight
[regular] 3lb 6oz, [long] 3lb 8.8oz
camping, backpacking
Manufacturer Warranty

Overall Rating

5 based on 5 ratings

Review Summary

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

Fits True To Size

Screen reader users: the following list provides a visual scale to illustrate the product fit. Please refer to the heading above for the fit type in text.
Runs smallTrue to sizeRuns large

What do you think about this product?


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5 out of 5 stars

April 13, 2024

Warm as Toast

Size Bought:

When I go winter camping I wake up early. Used to be because I was cold. With the Ram Ascent 900 Sleeping Bag I woke up at 8:30 am!!! That never happens. This was my first morning after my first night out with this bag. I was at 4,000 feet and it was plenty cold.

Winter Camper
5 out of 5 stars

October 1, 2022

Great Bag

I've used it once or twice and have initial impressions
Size Bought:
5' 11"

I recently used this bag on Mt Baker. The temp was only in the low 30’s, but the bag performed as well as all my Rab gear. I sleep a little cool so it was perfect. I suspect it would be fine down at least another 20 degrees if not more. A size regular worked fine for me and had plenty of room.

James C
5 out of 5 stars

September 11, 2022

Excellent sleeping bag , should

Excellent sleeping bag , should come with a compression sack Used for 8 days whilst climbing Mount Kilimanjaro was fit for the temperatures. Would recommend

Shaida H.

Originally reviewed on Rab

5 out of 5 stars

September 10, 2022

Expensive, but worth it

After a cold night camping with two sleeping bags inside each other I took the plunge and got this expensive bag. Sleeping with no layers on at 0 degrees was very comfortable, and the sleeping bag is soft and voluminous in such a way that makes it warm, extremely comfortable yet, somehow, surprisingly breathable too with no sweating. I don't know if the conditions happened to match my size and the bag perfectly, but it's the best few nights sleep I've ever had in a tent. I look forwards to using the Accent 900 to survive the forthcoming winter fuel crisis in style, and would like to ask Rab if they might also consider releasing a Rab@home duvet range?

Mark C.

Originally reviewed on Rab

5 out of 5 stars

June 15, 2022

yeh love it. little bit

yeh love it. little bit of down has leaked but an employee assured me this is normal. aside from that all good. comfy, lovely feel and weight to it. warm, adjustable hood and neck area which is muy beneficial. overall would recommend at the moment. a slight smell coming off it which i do hope is the down and not any chemicals from the special water repellant chemicals but i shouldn't be using it for too much longer so i'm not overly concerned about that for now. thanks Rab!

user image
adam b.

Originally reviewed on Rab