Here is an approximate list of what I took for a two month tour (geared) from London to Istanbul. Next time I would take less tools and spares as I didn't really use them. My advice to anyone wanting to lose a bit of weight would be to buy front panniers and use them on the rear - the rear panniers are far too big and this means you will take too much stuff!
vango banshee tent
sleeping bag (small down filled)
foam sleeping mat
msr dragonfly stove & fuel bottle
2 x saucepan (trangia type)
fork & spoon
cup
folding plastic bowl
1 litre water bottle
pump
spare tube
patches & glue
tyre levers
spare chain
1 x spare gear cable (inner only)
1 x spare brake cable + outer
spare toeclip straps
cable ties
hose clips
electrical tape
small tube lithium grease
small tub oil
chain tool
bb tool
crank extractor
small adjustable spanner
allen keys
swiss army knife (spartan)
head torch
led bike lights (cheapo)
whistle
a few paperbacks
various maps (bought/discarded along the way)
all this was packed into 2 small (front) ortliebs on a tourtec rear rack, with a small rucksack strapped to the rack containing food and valubles
tent was strapped to nitto mini front rack. Hope this is relevant/helpful.
I think I tend to get a bit over enthusiastic with taking tools, but I always take a few spare spokes, a freewheel remover and a small wide-mouth adjustable spanner for the freewheel tool.
Not much extra weight or space taken up but it meant that I could change a broken spoke - and they always snap on the rear drive-side first, hence the freewheel tool.
I think I tend to get a bit over enthusiastic with taking tools, but I always take a few spare spokes, a freewheel remover and a small wide-mouth adjustable spanner for the freewheel tool.
Not much extra weight or space taken up but it meant that I could change a broken spoke - and they always snap on the rear drive-side first, hence the freewheel tool.