One more thing, this is my list, what I carry no matter how many nights I spend out.
Pack-Karrimor Sabre 45l pack, with two side pockets
Water-standard nalgene bottle, usually kept empty (I fill it only when stopping for the evening, or for an extended break), platypus 3L water bladder, MSR miniworks filter (by FAR the best filter I've used yet!)
Food-snacks, breakfast & dinner for number of days out, plus an additional day, instant coffee, Trangia alcohol stove, GSI Soloist cookset
Clothes-extra pair of pants, extra T shirt, extra socks, fleece jacket, wet weather top & bottom (froggtoggs, wouldnt use anything else), wool hat, wool mitten/glove combo
Sleeping gear-Hennessy Hammock exped Asym hammock, with open cell foam pad, silnylon tarp, and either a Kifaru Woobie quilt for warmer weather, or a Golite down 20* bag for colder weather.
Other gear-FAK, headlamp, leatherman tool, beltknife, whistle, TP, 550 cord, AMK heatsheet (I sometimes use this under my hammock, to add insulation, if its cold) and sometimes a book.

Its sounds like a lot, but, honestly, when full, packweight is at the most 20lbs.