snibgo wrote:1. I use a Phoenix Phoxhole. 1kg, Goretex.
2. It depends on the temperatures, and you! For a typical UK summer night, I need a sleeping bag.
I used to use a OR Bivy which weighed about 1 kg. Now I use a two person tent that weighs just 1 kg. It is a solid, well built tent. A tent is much nicer than a bivy in so many ways, so for the same weight...it is a no brainer. https://www.bigagnes.com/Products/Detail/Tent/FlyCreekUL2
I wouldn't go without a sleeping bag even if it was only a 5 C bag which would only weigh about 500 gm. I often bring a silk liner too which can be pretty warm for not much weight.