I've been camping out of a Camper Longflap for some years, off and on, for shorter trips up to 4 or 5 nights
A couple of miles up the track from Rannoch station towards Corrour, 4th night of 5.
If I was being light, I'd take...
The tent, under the flap. I use an Akto, but there are lighter options, such as a Laser Comp, even if you do lose a bit of porch space.
Sleeping bag (PHD Minim 300 ~ 700g, good down to zero), silk liner
mat - Thermarest Neoair short (original version - I'd get an Xlite full length now)
Stove & pan - Optimus Terra Solo & Crux
(tea and dehydrated or cold meals)
Orikaso fold flat bowl & mug
plus wash kit, spare/off bike clothing to suit the season and remaining space, food to cover what I can't buy en route, kindle, waterproofs, puncture/tool kit.
One thing I don't take that makes a fair bit of difference is off-bike shoes. I use SPD sandals, which I find do fine for evenings after riding all day.
I'll often put the sleeping bag in a drybag strapped to the handlebars, which liberates enough extra space in the saddlebag to allow for luxuries such as a chair
I have tried a hammock, but by the time you've the hammock, a tarp to keep the rain off, and something to insulate underneath, you don't really save either weight or size over a tent, so the difference is in where you can find to spend the night.