Thermo-Lite Emergency Bivy Sack


Thermo-Lite Emergency Bivy Sack
Page Type Gear Review
Object Title Thermo-Lite Emergency Bivy Sack
Manufacturer Adventure Medical
Page By Alan Ellis
Page Type Jan 21, 2003 / Jan 20, 2007
Object ID 630
Hits 15821
An ideal survival/emergency bag for day hikes, summit attempts, cross-country skiing, snowmobiling, and more.

The Bivy Bag from Adventure Medical Kits provides lightweight protection from an unexpected night out. The durable Thermo-Lite fabric reflects and retains up to 80% of radiated body heat. Thermo-Lite offers higher performance for extended use than conventional reflective materials and provides superior handling in high wind situations. The survival experts at Adventure Medical designed their Bivy Bag to withstand repeated use, whether in emergencies or as an ultra-light sleeping bag for fastpacking

Made from a tough, four-ply, waterproof, windproof fabric (Thermo-LiteĀ®), which holds up to abuse while maintaining a soft feel and hydrophobic capabilities.

Thermo-LiteĀ® is a soft quiet fabric.

Foot vent and large opening provide ventilation to prevent you from getting hot or clammy.


Packaged in a bright yellow carrying sack.

Size: 36 in. X 84 in.




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Alan Ellis - Jan 21, 2003 10:28 am - Voted 4/5

Untitled Review
Whether day hiking or on summit day, this is always in my pack. For the light weight, compactness, and piece of mind, it get's 4 stars. I haven't had to use it yet, so when I do, I will re-evaluate my review.

marcminish - Feb 23, 2003 11:21 am - Voted 3/5

Untitled Review
I carry it with me anytime I'm in the mountains and even for quick summit attempts or day hikes. I have never had to use it (fortunately), but doubt it would work better than a bivy bag. However, these things are WAY cheaper so I dutifully carry one with me.

For the money it's great, but doubt its effectiveness as a heat reflector.

Matthew Holliman - May 22, 2003 1:42 pm - Voted 4/5

Untitled Review
Unless it's winter or early spring, I don't bother carrying a tent or tarp in the Sierra; I use a synthetic sleeping bag, and this bivy sack (really a glorified space blanket) is my main protection against an unexpected storm at night. Fortunately, I haven't had to use it as such yet--I'll update this review if I do!

I've tried using it once or twice in combination with a 50-degree bag, in an effort to gauge how well it's likely to work for fastpacking trips in the Sierra during the summer. It certainly seems to help for a while, but I'm a bit skeptical about how much body heat it actually reflects back. Nonetheless, for the size and weight (it really weighs next to nothing), and the peace of mind it affords, I can't complain.

Incidentally, it makes a great groundsheet, too--compared to a normal tarp or tent footprint, there's something about the space age material that makes dirt and other stuff brush off very easily!

Martin Cash - Apr 13, 2004 1:35 pm - Voted 5/5

Untitled Review
For lightweight summer alpine trips, where the weather will be warm, this thing is great. I have a 40 degree synthetic bag that I use with it. I've stayed warm just fine. The sack keeps the dew off your bag and reflects heat nicely. If the weather is too cold or windy for this thing to work, I'd rather be in a tent than one of the other expensive and bulky bivy sacks.

96avs01 - Feb 5, 2006 1:06 am - Voted 4/5

Untitled Review
This bivy combined with a TNF Nuptse + MH Chugach pants + Ridgerest has been the ideal sleeping setup in numerous ice/snow caves. For the minimal weight you can't beat the added piece of mind for whatever your outing.

puddlecruiser - Mar 3, 2007 3:56 am - Hasn't voted

Extra safety, but not your main protection
I'm not sure if I have the 2 person or 1 person version, but regardless, I've used it a few times. My sleeping bag is an old beat up rectangle bag I got when I was 13. Slipping my sleeping bag inside this "emergency" bivy kept me warm at 13,800 on Shasta, inside a tent. I also used it without the tent in the N Cascades, for a nap, in a sleeping bag keeping my boots on. The bivy is held together by velcro, which obviously tears open without much force, so I found I kept accidentally opening the the shoulder area of the bivy, which I found extremely annoying. I'd rather not have the velcro openings, because in the emergency you're using this in, you're probably not too interested in opening the bag, which is the equivelent of unzipping your sleeing bag half way. The ventilation opening around the feet is nice, I guess, but I just kept it closed in order to keep as much heat inside as I could. I was toasty warm, and without it I probably would have been miserable. If you're sleeping with just this emergency bivy in the open elements, without a sleeping bag or tent, in alpine or wintery conditions, morning couldn't arrive fast enough, but I think this will be in every alpine trip I take. Get one.

2skinners - Jun 30, 2007 3:46 am - Hasn't voted

I haven't had to use this either but I take it with me on any outings that have the potential to be extended outings. It is very lightweight, I hardly notice it's even there. I'm sure any emergency bivy is bound to not be comfortable, so I don't think this would keep you very comfortable, but keeping you alive is ultimately what is important. If I ever have to use it, I will update this review.

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