For a quick simple one nighter I go with
sleeping bag, bivvy bag, blow up mat
warm jacket, trousers, hat
micro stove, coffee, mug, instant porridge, water, hip flask, cereal bars
head torch, toothbrush, basic bike stuff (multitool, puncture etc)
Strapped in a mix up of big saddle bag, roll strapped to the bars, medium sized rucksack.