Did an overnight on the Pennine Way last week with:
Granite Gear Vapour Trail pack
Kathmandu Tarp
ME lightline sleeping bag
RAB ultralight Bivi
Walking Poles (Leki)
Thermarest Neoair 3/4 mat
BushBuddy
Whitebox stove (No firewood on the moors)
Meths 0.5lt.
Spork
Titanium pot 0.9lt.
Down Gilet
Waterproofs
Spare socks
Water bottle
Food (dehydrated main meals and couscous and porridge)
Fallkniven U1
and, of course, the clothes I was wearing.
If the weather were warmer I'd replace the ME lightline with my Pipedream 400 which is smaller and lighter and if I were sure of getting firewood I'd leave the Whitebox and meths.
My pack was pretty light until I added two days food, water and meths. Difficult to cut down in this area so that's why I try to make everything else so light.
This, of course, is a walking set-up. If I were going into the woods, setting up camp and staying the night, I'd take different stuff, including axe, knife, and other stuff to keep me amused. (A catty, my iPod, my Kindle, bow and arrows....
)