I'm obviously not as tough as Ryan because I have a Macpac Sanctuary 800 XL sleeping bag, self inflating mat and a Macpac Bivvy Bag. Weight: TBA.
I've found that having a Fly over the top of you can make a difference to your comfort when the temperatures take a dive. The Fly seems to nicely hold the descending frost/dew from forming on the bivvy bag in the morning, which means you stay warmer and dryer. In summer this isn't an issue of course, so I don't take the Fly.
I like the Macpac version of the Bivvy bag as it has a lightweight aluminium pole that when fitted keeps the bag up off your face. I also now tend to use it in huts when hunting during winter after an experience where it was -3°C inside the hut (mate had a thermometer with him....WTF?) and we froze for a couple of nights. It was then we discovered the benefits of a bivvy bag as added insulation. I'm surprised we took two nights to figure that out actually.
Travelling light sure opens up your ability to push further out into the more remote areas. Good fun. Enjoy it.
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