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I didn't consider the duvets - I don't quite see the point compared to a normal bag?
The theory goes that insulation beneath you gets compressed, so it doesn't actually do any insulating anyway - that's what your sleeping pad does. So the duvet is just as warm for half the weight/size.
For example I find I am (almost) as warm in my 450g Alpkit duvet as I am in my 1000g StS summer bag. Also because it doesn't have any zips/toggles/hood, it has proportionally more insulation for its weight (if that makes sense). Plus I find I sleep better because I'm not constricted, that's a personal thing though.
The only downside is when one leg creeps out in the night and you wake up with one freezing leg. But personally I find that better than being woken from getting tangled up, which I do in a regular bag.
Polyprops are warmer than merino for the same size/weight, plus they dry much faster. On the downside they're stinky, so I only wear them at night. I've heard good things about capilene thermals but they're pretty uncommon here in NZ.
Relying on tiredness for a good night's sleep is a surefire path to utter exhaustion...
lae-
the duvet is just as warm for half the weight/size
But you've got to add the sleeping pad to that.
I might get some foam and cut it to size but not sure about sleeping pad at all really. Depends if I'm cold and trying to sneak into buildings with cold/hard floors or warm and trying to find flat/soft grassy spots?
My current bag unzips all around so you can use it as a duvet but because it's a bag it's quite large in that form.
Utter exhaustion is the plan :)
hippy
I didn't consider the duvets - I don't quite see the point compared to a normal bag?
I'm pretty sure I had polypro thermals on when I thought I was going to die camping in Germany. Thinking about it now, I was pretty fresh off the boat and started the trip in UK summer so I probably just wasn't very acclimatised and possibly hadn't eaten or something. I was camping near water too which tends to be colder. I dunno, maybe I'm just pissweak?
I'm used to bugs and crap from camping in Oz but I am thinking that the open-face Hunka might be less fun than a fully closeable bivvy option when it comes to mozzies and stuff that wants to nibble on your face at night. Buzzing bugs are a surefire way to keep peeps awake, though after 16hrs of riding maybe not?
I doubt I'll use a tent though for speed reasons but a full bivvy might yet happen.