I was thinking something versatile - mainly use in conjunction with a car, but abroad, i.e. compact enough for flights and transportation to the destination. I worked in Kazakstan couple of years ago. I decided to rent a car with my colleague and drive somewhere in the countryside outside Astana during the winter. Our local colleagues told us it was absolutely bad idea - if you break down, and Astana is officially the second coldest capital in the world, then you are in serious problem, especially because the mobile coverage outside the city is not great.
Like the idea of survival bivi bags and bothy bags. Which one in your opinion is a better option? And how to isolate yourself from cold ground? I cannot think of anything but a small inflatable swimming mattress, other things might be just too big to carry around "just in case"