I think you mean the magical 5kg base weight which is easily achievable if your bank account is overflowing... Pack, Sl' bag, Cook kit and Shelter.
No changes of clothes except 1 pair of socks.
Extra layer for evening if req'.
That's ex water, which you can find on the way, (other than in a drought) and ex food.
No cooking...just add water to food.
Absolute max' for an overnighter COULD be 7/8kgs. SHOULD be 6/7kgs.
Ditch the toothpaste...messy..
Use Eucryl toothpowder. Very light weight. Just dip in your toothbrush ( the 'cut-off' version, of course !!!), no mess.
No soap, towel deodorant..What for??? you're camping, not going out to dinner!!