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Your cart is empty.It's frustrating to get your sleeping bag wet with condensation when you hike,People who have traveled long distances have probably experienced sleeping bags that become less warm due to moisture. I tried to solve this problem by covering the sleeping bag with a tyvek,Because tyvek is waterproof and breathable,But because tyvek is so lightweight and easy to shift, it was inspired by the bottomless sleeping bag,Full closure of the foot can better protect the foot sleeping bag, also has the function of positioning,The upper part of the open design only needs to be covered on the sleeping bag, no sense of restraint,It is waterproof while also has a certain heating effect. However, due to the waterproofing property of tyvek itself and the design structure of this product, it is not recommended to use it alone!
Marco
Reviewed in Italy on April 14, 2025
Consigliatissimo e indispensabile ; proprio come il sacco a pelo,il tappetino in schiuma che si piega a fisarmonica , come il materassino gonfiabile e il suo sacco in allume quando si bivacca in inverno o nella stagione umida diciamo!L’acqua è l’umidità non entra ma il sudore traspira!!!Forse é un po’ delicato , ma se usato lontano da punte aguzze come ramponi o bastoncini , lontano da fuoco che scoppietta no problem!
Karlee Foley
Reviewed in the United States on September 4, 2024
Weighs 7 ounces on my scale without stuff sack. Fits me and I’m 6’1”. Durable thick shock cord and large plastic cinches. Also the red part is pretty thick fabric. Large zipper. I plan to tape the seams inside with cuben tape just like how zpacks waterproofs their bags. Should be good after that. Also with this bivy, my theory is you don’t need a ground sheet since people use tyvek as a ground sheet anyway. So instead of buying a lightweight silnylon bivy with a ground sheet to protect it, I just use this for cheaper and possibly lighter. Less stuff. A tyvek ground sheet weighs 3.8 oz and a bora bivy weighs around 5 oz. So this would be lighter and cheaper than that setup.
Charles
Reviewed in Canada on February 6, 2024
I always wanted to be a joint
Tom Track
Reviewed in Germany on November 6, 2024
(3/5) Größe passt grob, könnte am Fußende jedoch ruhig etwas breiter sein; nicht geeignet um größere Isomatte mit reinzunehmen.(3/5) Trocknet langsamer als erwartet.(5/5) Sehr leicht und klein verpackbar.
Mountain Rachel
Reviewed in the United Kingdom on July 21, 2023
Not the weight advertised. The seems are also not taped, rhey are stitched woth very obvious holes. It is large though. Returned.
Customer
Reviewed in Canada on June 28, 2023
3 nights in single wall tent with this over a down bag. Probably added 5 degrees warmth. Minimal condensation inside bivy sack, less than i thought. After the third night toe box of my sleeping bag was damp, (my tent dripping on me) the bivy sack maybe leaking slightly but tough to tell....it held out long enough and happy with purchase. Very light.
AT
Reviewed in Canada on December 29, 2023
Every claim in the product description is false. Period. Interested in details? It's made from Tyvec - non-breathable, non-insulating, water resistant synthetic fabric. In cold weather all the vapors coming from your sleeping bag will immediately condensate inside on top of your sleeping bag. Being just water resistant not water proof it's useless as rain protection. It provides zero insulation but could add a bit of wind protection if used in a warm weather without any shelter. On top of that it's very narrow and restricts any movement inside. Make an informed decision.
Jewel Sandeen
Reviewed in the United States on June 27, 2021
To start I'll get the bad out of the way. The difference between "Type A" and "Type B" was a little confusing. Fortunately I was able to figure out which one I needed based on comments left by other people. To be clear, I got the "Type B" which was the one with the drawstring mummy-style hood and the zipper. I highly recommend paying the extra few bucks to get that over the Type A version.Then there's the good. To start, the price was right. Most bivy bags cost far more than this even for the lower quality ones. Tyvek is sturdy material and doesn't rip easily (unfortunately my dog did still tear a hole in it but that was easily fixed by purchasing some Tyvek tape). The bivy is incredibly spacious. I'm not a big guy but I've used other brands that felt much more confining and were more difficult to get in and out of. I used it while camping in my hammock and it did a great job of cutting the wind. It didn't rain so I can't say how well it will hold up. I did test it in my shower. The material got damp on the inside but not really wet and there was no water pooling inside, so I suspect that it would perform similarly in the rain.All in all, this was a good purchase.
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