User Review: Outdoor Research Alpine Bivy
I'm 185 cm tall slim 90 kg and have wide shoulders. Living in Australia we normally have "warm" nights from 5'C through to 10'C in winter.
Purchase of the OR Alpine was to replace my 20-odd-year-old lightweight and tight Gore-tex bivy which welled up one stormy night!
So far I have spent temp ranges from about 10'C through to 5'C at night in dry weather through to extreme storm condition in about 40 knot winds (maybe more!) with extreme rain conditions and been dry all night for the latter.
In more recent rain conditions I have decided to start using a SilTarp to keep my boots and pack dry and this has significantly aided my body not getting as wet as I enter and exit the bag. OR certainly has done some good research with this bag and though the entry might require practice, it is certainly enough for its purpose. A side entry would only allow more wet into the bag.
For me it's a bomb proof water tight accessory. I have not gotten anymore condensation than I would have reasonably expected in a tent. An optional foot flap opening might be good for Australian conditions to allow for better ventilation.
I've made one change to the bag and that was to install a small clip from a bra strap to the loophole designed for the rope attachment and this keeps the storm flap from falling on my face. The storm flap really needs some Velcro on the inside to hold it up an this will be my next mod.