A night in the bivy

In preparation for my first winter ultra I decided to try and sleep outside last night in my sleeping bag and bivy. I wanted to see what it was like, and what I needed to change. I wasn’t sure if I’d make it all night, as I did need to go to work today, but even a few hours would be a huge benefit.

Here was my equipment list:

  • Eureka Lone Pine 0 degree bag
  • Outdoor Research Helium Bivy
  • REI Flash inflatable sleeping pad
  • Two layers of clothing on the bottom, three layers on the top, heavy wool socks

I ended up being outside from 8:30pm to 1:30am. The only reason I got up was that I had to pee. If it wasn’t for my middle-aged bladder I would have slept longer. I could have crawled back into the bag, but decided that I could call it good and go inside, since I had been out there for a solid 5 hours.

So what worked and what didn’t?

First, my bag was amazing. The air temps last night were in the single digits, so it was right in the range for what my bag was made for. I was probably overdressed on top and could have shed a layer there. If anything I could have used another thin sock on my feet. My only complaint about the layout of my bag is that the storage pocket is in an awkward place on the inside roof. I wish it was closer to the side as I felt like my phone was in the way when it was in the pocket.

The bivy sack did it’s job and kept all my heat inside. It actually got to be a bit too warm and I ended up venting the opening a bit, despite it bringing in cold air. The main issue with bivies is the condensation. When I woke up at 1:30 the top of my sleeping bag was a combination of wet and ice crystals. The entire inside roof of the bivy was coated in water as well. Thankfully, it wasn’t dripping on my face or anything, thanks to the pole that holds up the bivy over my head. However, getting my sleeping bag wet isn’t ideal.

Bivies are also somewhat claustrophobic. They’re small cocoons that aren’t much bigger than your body. There were a few moments when I bedded down where I had a brief moment of anxiety, but it passed quickly. It also helped when I vented the bivy as it allowed me to see the outside a bit more. In the summer I could use the screen closure instead of the solid one which would help a lot more as well.

The final piece of gear was one that I wasn’t that pleased with. I love my REI Flash pad, and I thought that its R-value of 4 would give just a bit more insulation below me. However, I tend to sleep on my side which means that my hip compresses the pad completely in a small area. That also meant that my hip got colder than the rest of me. It wasn’t terrible, but I think for my race I’ll grab a foam Z-Pad instead.

Finally, I should have cleared out my sleeping space better. I just plopped everything down and crawled in, and that meant that the snow was a bit more uneven than it could have been. I could have made things more comfortable if I had patted things down with my boots a bit more before laying down the bag. Not a big issue, but something to consider for another time.

Despite a couple of annoyances, I’m incredibly happy with how the evening went. In a winter ultra context, I’m never going to be bedding down for longer than a few hours at a time anyway. Getting 5 hours of sleep, like I did last night, would be a luxury in a race. If I were to go winter camping, I wouldn’t do it in a bivy, but would instead bring along a tent, and additional equipment to make things comfortable. Therefore, I’m counting last night as a huge success. I have a couple things to adjust, but otherwise I feel in good shape for Tuscobia.