Hi Ed,
I carry a Terra Nova equipment Bothy 4 emergency survival shelter. The brand might be Wild Country now. It is heavier fabric than the Lifesystem (and other) models which I used to carry and was essential for my activation yesterday. It is a faded turquoise colour and if there is direct sunlight it actually feels warm inside, well maybe not warm but comfortable!
I carry a section of thick camping mat (Decathlon cheapest) to sit on, but have lost many of them as they often blow away when you stand up. You have been warned!
Ciao
Colwyn