Summer temps, prepared for whatever or get by, one night. Stuff sacks/ditty bags part of packed item, such as stuffed sleeping bag. Good point, I need to slip in a rain anorak. Repair kit/duct tape could be part of a mattress or FAK, knife with fishing gear or the FAK.
Some things have to be a system, such as bringing a tent, do I count the stakes and poles towards the 12 items? smile
I think So far:
Pack
Bivy/shelter
ground cloth
sb liner
sb
mattress
Cooking kit (stove, windscreen, pot, spoon, matches/fire starter
Water filter
water bottle/bladder
jacket
anorak