Versatile, comfortable and light – the Ascent Ac2 Sleeping Bag from Sea to Summit is the adaptable choice for accompanying you on different kinds of adventures.
This bag has a tapered rectangular shape which is roomier than a mummy style bag but will still keep you warm. It’s easy to adjust the Ascent depending on the weather as it has free-flow triple zips. The half zip on the right side allows you to fold it down to free up your arms, the full-length zip and separate foot zip means you can use it as a quilt in warm conditions, and you can zip everything up on a chillier evening. The Ac2 has a -4°C comfort rating and -10° lower limit so its suited for colder sleepers and use in cooler conditions.
The shell and lining are made from lightweight nylon to keep the weight down, and it’s filled with R.D.S certified 750+ loft down for plenty of insulation. It’s got 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. You can also keep your valuables close as you sleep in the large internal security pocket.
Be prepared for changing weather conditions with the adaptable Ascent Ac2 Sleeping Bag from Sea to Summit.
-4°C comfort rating and -10° 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
Comfort Rating:
−4 °C
Snowys Comfort Rating:
−4 °C
Lower Limit:
−10 °C
Shape:
Tapered Rectangle
Fill Ratio Top/Bottom:
60/40
Max. User Height:
183 cm
Internal Girth:
155 cm Chest | 146 cm Hip | 122 cm Foot
External Dimensions:
202L x 71W cm
Packed Dimensions:
39L x 18.5W cm
Compressed Volume:
10L | Compression Sack Size S
Material:
20D Nylon
Fill Material:
RDS 750+ Loft ULTRA−DRY Duck Down™
Fill Weight:
550 g
Lining:
20D Nylon
Zip Draft Tube:
Yes
Neck Draft Tube:
With Dual Cord Adjustment
Zipper:
#5 YKK | 1/2 Right Side | Full Two−Way Left | Foot Zip | Zip Coupling Compatible
I’m looking between the S2S ascent 1 or 2 for outdoor ed trips. Mainly wilderness overnight hikes 1 answer
I’m a warm sleeper and I’m worried I’ll get too hot in the Ascent 2. Thoughts?
Paul - Doreen (1 year ago)
G'day Paul,
There are a number of considerations to make here, and you'll want to think about the lowest temperature you're likely to encounter, along with your entire sleep system. The comfort temperature will give you a good indication of the temperature you'll stay warm at, this assumes you'll be sleeping on an insulated mat, in some form of shelter. The wonderful thing about the Ascent Bags is that they're very flexible, you can open the foot zipper separately and stick your feet out, or you can zip down the quarter side zip and have an open fold style, or if it's really warm you can open the whole bag out and use it like a quilt. My general recommendation is that if you afford the extra weight and cost then a warmer bag will always give you more flexibility. There is nothing worse than having a 'not quite warm enough' sleeping bag, and spending the night cold and uncomfortable. If your bag is a little too toasty for the temperature on a trip you can always open it and ventilate it.
Leece - Snowys(1 year ago)
RH Zipper1 answer
Hi, So the bag is compatible to join another bag, but I am only seeing the LH zipper option, does this bag come with a RH zipper or would we have to get another compatible RH zipper bag?
Mark - Ballarat(1 year ago)
G'day Mark,
The unisex Sea to Summit bags all have Left Hand Zippers, they have zip coupling that can connect to Women's specific bags with Right Hand Zippers. The Women's Equivalent in the Range is the Altitude At1.
Leece - Snowys(1 year ago)
Compressed size1 answer
Can you confirm whether the will compress down to the same size as the AC1
Lindsay - Bayswater(1 year ago)
G'day Lindsay,
The Ac2 will pack down a little larger than the Ac1 as they've got extra down in the bag which will take up a little more space.
Leece - Snowys(1 year ago)
Hi , just trying to decide between the Ac2 or a spark3?1 answer
Packable size between them and warmth between duck and goose down ?
Mark - Morley (2 years ago)
G'day Mark,
The Ac2 and the Spark SP3 are both great options, the Spark will pack down much smaller than the ascent as it has 850 loft goose down, as well as lighter weight nylon than the ascent. The overall weight is approx 500g lighter, for a similar comfort rating, and a significantly smaller packed size.
Leece - Snowys(2 years ago)
Bag size1 answer
Hi, I am just looking to purchase this sleeping bag though trying to decide if I should go for the longer bag. The regular says it’s for a maximum of 183cm and that is exactly my height. Would I be better off comfort wise going for the longer bag? Thank you!
Martin - Sydney (2 years ago)
G'day Martin,
We'd recommend having a look at the product video, and watching right through to the end. Ben is 185cm tall but he gets in the bag and finds it quite comfortable. The long will suit users up to 198cm, so it might be a slightly roomier option, but it's hard to give an exact answer purely based on height, the Long is also a little wider which might help if you're broad-shouldered too.
Leece - Snowys(2 years ago)
Which liner suits the Ascent AC2 Regular?1 answer
I’ve recently bought the Regular size Ascent AC2 sleeping bag and am wondering which liner would best suit this bag.
John - Albury(2 years ago)
G'day John,
You can essentially use any regular, mummy or tapered mummy liner with the Ascent AC2 regular. There are various options depending on whether you'd prefer thermolite, silk, cotton or fleece.
Leece - Snowys(2 years ago)
Ascent vs Altitude1 answer
Hi, I am a 158cm female (58kgs) and don't like the feeling of being constricted and I fell the cold - I am just wondering which bag do you think would be most suitable - the women specfic Altitude or the unisex Ascent? Thank you
Michelle - Newcastle, NSW(3 years ago)
G'day Michelle,
The Women's specific bags have a little bit more room across the hip and a little more insulation in the foot box. So based on your description I'd probably steer toward the Altitude over the Ascent.
Leece - Snowys(3 years ago)
How small does this bag compress1 answer
Looking to understand how small the bag is when packed and how much space it will take up in a pack
Mark - Waikiki (3 years ago)
G'day Mark,
This sleeping bag, as a guide packs down to about 20-30cm in height and width - this depends on how much effort your willing to put into this though! On the 11th picture on this page, we give a comparison to an Eddy bottle so you have a visual plus the video also gives some info on compressing it down.
Susie - Snowys(3 years ago)
Pillow retainer 1 answer
Hi! Does this bag have a feature to keep a pillow in place?
Melvyn - Waterford (3 years ago)
G'day Melvyn,
The Ascent Ac2 doesn't have a pillow retainer feature, but the new Sea to Summit sleep systems have an integrated pillow lock that will attach your Sea to Summit pillow direct to your Sea to Summit mat. When you're tucked into your sleeping bag the pillow will stay attached to the mat underneath your head.
Leece - Snowys(3 years ago)
Video please1 answer
Can you please do a video on the Ascent range similar to the Trek range you have just posted please. The two bags seem to be very similar.
richard - 2300(3 years ago)
G'day Richard,
Thanks so much for your video suggestion, this is in the works and hopefully not too far away!
In the meantime, the Trek range is a great option for versatility. It's suitable for car camping, but ticks the boxes for overnight hikes aswell. If you're looking for something more hiking specific, thats warmer for the size, with a higher loft, the Ascent series is the way to go.