You’ll always be prepared for a good night’s sleep on your backpacking adventures with the cosy and adaptable Altitude At1 from Sea to Summit.
This sleeping bag features a rectangular design to give you extra space so it’s great for restless side sleepers, it’s also wider at the hips and narrower at the shoulders to cater to women. To keep the weight down, the shell and lining are made from light breathable nylon that packs down small while the vertical chest baffles prevent the down from migrating. Filled with extra RDS 750+ ultra-dry down for superior insulation, with oversized draft tubes to trap heat, and THERMOLITE synthetic panels under the feet – the Altitude is designed to keep you warm.
You can keep cosy when it’s chilly and ventilate on a warmer evening thanks to the Free-Flow triple-zip design. The left has a half zip to free up your arms or fold it down, while the full-length two-way side zip and separate foot zip allows you to use it as a quilt. Or if you’re cold, close up the zips and snuggle down in the generous hood. While you’re snoozing, you can also keep essentials like your phone or headtorch handy in the large internal security pocket.
With a great balance of comfort and weight and a versatile design that can be adjusted according to the weather – the Altitude At1 from Sea to Summit will have you sleeping soundly.
-4°C comfort rating, -10°C lower limit
Tapered rectangular women’s specific design with wider hips and narrower shoulders
Free-Flow triple-zip design for adaptability
Half zip on the left and full-length two-way side zip and separate foot zip
Super light nylon shell and lining
High-quality RDS certified 750+ Loft ULTRA-DRY Duck Down for insulation
Oversized draft tubes prevent body heat escaping
Panelled footbox and 3D hood
Extra down overall and THERMOLITE panels under the foot area
Vertical baffles over the chest to prevent cold spots
Large internal security pocket
Storage cell and a lightweight compression bag for storage
Hello! Can you please confirm if this bag will zip to a Latitude LtII Regular Left hand Zip? Thank you so much!
Rebecca - Midland, WA (3 months ago)
G'day Rebecca,
Unfortunately they're not backwards compatible to the latitude bags, I'm sorry! The Altitude is from a new season, and the zip coupling system was unique to the Altude backs onward.
Lauren - Snowys(3 months ago)
Warm enough for Overland Track in March1 answer
I was wondering if the At1 would be warm enough to use for the Overland Track in March. I am tossing up between this bag and the At2 but also trying to keep weight and size to a minimum. Thanks
Denise - Sydney(4 years ago)
G'day Denise,
You should be fine with the At1 bag on the Overland Track in March, however you never know what will happen in Tassie! In terms of average temperatures you should be fine, however I've heard stories from colleagues who have encountered snow in January-March a few times in some sections, so it's worth considering your entire sleep system. If you've got a nice insulated mat, and some options for layers and a liner if needed then I think you should be ok.
Leece - Snowys(4 years ago)
Unzips to fully open?1 answer
Does the zip down the side run along the bottom so it can open fully flat? Looking to use it as a doona/mattress topper in summer when it's warm.
Alison - Sydney(4 years ago)
G'day Alison,
Yes you can fully open the Altitude Sleeping Bag up, there is a separate side and foot zipper so you can lay it completely flat, or unzip sections as needed.
Leece - Snowys(4 years ago)
Gear/Finger Loops for Pad1 answer
Does this bag have any finger loops so it can be attached to a pad? It looks quite slippery material. If so how many loops?
Bec - Perth(5 years ago)
G'day Bec,
The Sea to Summit Altitude At1 bag doesn't have any gear loops on the base to attach it to your mat. These bags generally aren't too slippery, but this obviously depends on the mat you use under it too.
Leece - Snowys(5 years ago)
Joining bags together1 answer
Can this bag be attached to a sea to summit explorer bag to make a double bed or are they only able to fit the same altitude design, I understand if they are connected it will give an irregular shape
Tyler - Penshurst(6 years ago)
G'day Tyler,
You can definitely join together the Altitude and Explore range of sleeping bags. As you indicated the Explore model will make the shape a little irregular, but Sea to Summit has confirmed at a recent training that you can do this.