Packing it in

I'm about to leave for a few days of cycling, and although there's not too much space in the panniers, what do I need to take apart from a few bits of clothes and some things to draw with?

I make a small pile of equipment to take - except I have this sneaking feeling that I'll end up using what I usually do: a thick black pen and a sketchbook. I like how pared down and simple these two are: black on white has an enduring appeal for me. The pile I intend to take is hardly extravagant — look at it. Taking a waterbrush and watercolour set is hardly going overboard, but how much will I actually use?

@jameshobbsart