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A good night's sleep that won't weigh you down.
A good night's sleep starts with the proper shelter, such as the Ultralight Bivy Sack from Mammut. The top of the bag is Mammut's ShelterTX fabric and the bottom is made of a slightly more durable EnduranceTX—both are very waterproof and utilize a polyurethane membrane to prevent moisture from getting at you. Extremely lightweight construction (under a pound) and an integrated stuff bag make this bivy easy to always have in your pack, whether it's as your planned sleeping station or an emergency shelter.
- shelterTX main fabric, enduranceTX bottom fabric
- Polyurethane waterproof membrane
- 15K-rated waterproofing/breathability
- Integrated stuff sack
- Drawstring opening
- Item #MAM00QA
- Q & A
- Familiarity: I've used it once or twice and have initial impressions
I am mostly a hammock camper and obviously don't hit the ground often but every once in a while, I will break out a tarp or Trailstar (as pictured). I own another Bivy, the OR Alpine but was looking for a lighter and more compact Bivy, so I decided to get the Mammut Sphere. Let's get into the specifics.
This Bivy has enough room for a smaller pad, say 1.5" or a Z-Lite or foam type pad and a more compact down sleeping bag. If you have a thicker pad and sleeping bag or in my case, a down hammock top quilt, then you would be better off laying down some Tyvek or a SIL nylon bathtub for a ground cover and putting the Bivy on top of your pad. In colder conditions, you can put a foam pad inside as well. Bottom line, for the weight and compactness, it does the trick.
This Bivy, when packed in its ingenious integrated stuff sack, fits in the palm of my hand. The weight has been tested as being correct as listed maybe a scaunch less.
I always use either my Terra Nova Tarp or Trailstar and therefore, cannot review its use of waterproof nature.
I really like this Bivy and in 3 seasons with the specifics as mentioned above, this makes for a super light and super compact shelter for ultralight backpacking.