Sea to Summit Ascent Sleeping Bag
Features & how to pack away
Details & Specs
Lightweight yet warm and versatile, the Ascent Ac1 from Sea to Summit is an adaptable down bag which will keep you comfortable on all kinds of adventures.
This bag has a tapered rectangular shape which is roomier than a mummy bag but will still keep you warm. You can adjust this design depending on the conditions thanks to the free-flow triple zips. With a half zip on the right side you can fold it down to free up your arms, the full-length zip and separate foot zip allows you to use it as a quilt when it’s hot, and you can close it all up when it’s chilly. The Ascent Ac1 has a 2°C comfort rating and -4° lower limit so it’s suited to general 3 season use.
Filled with R.D.S certified 750+ loft down, this bag provides plenty of insulation and it has vertical baffles over the chest to prevent cold spots, a side block baffle to keep the 60/40 fill ratio and oversized draft tubes to trap body heat. To keep the weight down, the shell and lining are made from breathable yet lightweight nylon, while the large internal security pocket means you can keep your valuables close as you sleep.
Prepare yourself for a myriad of sleeping conditions, with the cleverly adaptable Ascent Ac1 Sleeping Bag from Sea to Summit.
2°C comfort rating and -4° lower limit
Tapered rectangular shape balances space and warmth
Versatile down bag which can be adapted to weather conditions
Half zip on right side provides movement for both arms
Full length two-way left side zip and separate foot zip allows for us as a quilt
R.D.S certified 750+ loft duck down for insulation
Oversized draft tubes prevent body heat escaping
Vertical baffles on the chest to prevent cold spots
Side block baffle to maintain a 60/40 ratio
Generous hood and dual cord adjustment
Large internal security pocket for valuables
Compatible LH and RH bags zip together
Snowys Comfort Rating:
Fill Ratio Top/Bottom:
Max. User Height:
155 cm Chest | 146 cm Hip | 122 cm Foot
205L x 71W cm
39L x 18.5W cm
10L | Compression Sack Size S
RDS 750+ Loft ULTRA−DRY Duck Down™
Zip Draft Tube:
Neck Draft Tube:
With Dual Cord Adjustment
#5 YKK | 1/2 Right Side | Full Two−Way Left | Foot Zip | Zip Coupling Compatible
The Ascent Ac1 has stitched-through vertical baffles in the torso and horizontal baffles in the lower half.
Kaya - Snowys(1 month ago)
Packed Size1 answer
Hi, is the 'packed size' the smallest possible? ie. Can it be compressed further in a Compression sack?
Grant - Gosford, NSW(1 year ago)
The packed size is the uncompressed size of the bag stuffed into the compressions sack. It is possible to get this smaller, however, there isn't an advertised compressed size as you'll probably get slightly different sizes each time, and it also depends how strong you are!
Lauren - Snowys(1 year ago)
Warmth rating with liner1 answer
If I added a Sea to Summit Reactor liner would this increase the warmth rating to make it equivalent to the AC2?
Lindsay - Bayswater(3 years ago)
A Reactor Liner will help keep you a little warmer, however, you will need to account for your entire sleep system when considering the bag you go for. If you're likely to camp/hike in temps lower than 2'C then we'd recommend looking at the Ac2.
Leece - Snowys(3 years ago)
Recommended (Silk) liner?1 answer
I am looking into buying a liner for this sleepingbag but I am a bit confused which one is recommended. Can you please give me some options for liners?
Martine - Pinjarra(3 years ago)
Essentially you can pop any single liner in the Ascent AC1, however if you're looking for a lightweight option then the silk liner will be a good option. The Silk Travel Liner - Tapered Mummy will most likely be the best option, or if you're after a something with a hood then the Hooded Mummy will also suit.
Leece - Snowys(3 years ago)
Looking for versatility - BNE to NZ?1 answer
I live in Brisbane and am looking for a versatile sleeping bag for the cooler months here in the hinterland. I’m also looking to trek Tas and NZ, probably late autumn or early spring. Do you think this would be suitable? If not warm enough, would a liner help much? Thanks
Mikael - Brisbane (4 years ago)
All things considered, I reckon your best bet if you can afford the extra $50 or so, would be to go with the Ascent Ac2. I've also had a chat with some of our more seasoned Snowys adventurers and they concur. Essentially TAS and NZ can get super cold, and even in the height of summer you can get snow. The consensus would be a bag that is at least -2, as you should always start off with a comfort rating that covers as close as possible to the lowest temp you expect to be in. Whilst it's awesome to have a liner on hand, best practice is not to rely on them for the extra warmth that could be the difference between a good night's sleep and a very, very rough one (personal experience talking here!). Also, being a natural fiber you'll be able to use it comfortably in much warmer temperatures, with the additional options of the zip configurations or opening it right out like a quilt.