tyvek makes a good tarp too 😉
i got an eyelet reinforcing kit from the ironmongers and turned some tyvek into a nice tarp
im in the duvet jacket and light bag camp.
i was too warm when i car bivyed (that is bivying outside the car because theres **** all room for a tent)up at strathpuffer -10 comfort synthetic bag , rab bivy bag , thermarest and a ATG 650 fill down jacket – great nights sleep though
summer time i use a ajungaluk tundra combined with a pair of altura winter cruizers and a down 650 fill vest if its a cold night – no thermarest. the vest also makes a good pillow if stuffed into a dry bag and the dry bag is covered with a buff – stops face sticking to it