stato i carried everything -all my girlfriend had to carry was "her things" - sleeping bag , clothes , mat etc
we had msr whisper lite stove , pots pans , fuel , spatula , spork, orikaso origami cup/plate/bowl
our sleeping bags were in dry bags in the pannier but our wee arric (started as wee arrics but morphed into much better kathmandu mats of similar size when the arrics bust after 8 days) in a dry bag strapped on top , tent was on top too
2 sets of cycling clothes , a waterproof , a fleece set of light weight packable trousers - pair of sandles strapped to the outside on top, arm and leg warmers
4 litres of water - on the pannier rack top under sleeping mat and tent
at one point i was carrying 6 books as well ! - thats how much room i had.
cant think of anything else but there was plenty room in our panniers - 55 litres though - jaynes were 18kg mines were 25 - before water and fuel