I fit everything in just rear 40 liter Ortliebs. This would include a food bag, stove, pot, tools/parts, an extra jersey, base layer, sleep shorts, comfy evening shirt, camp towel, toiletries, sleeping mat, sleeping bag, pillow. The tent goes on the back rack in a dry bag (15 liters) with a little extra room for extra storage if I need it. I think you'd do fine with 32 liters if you don't go overboard with the clothes.

Two tips if you are going for comfort. People vary a great deal on this but I love a real stuffed pillow. You might also do OK with a lightweight inflatable pillow or if you are really not picky just shove your clothes in a stuff sack (lumpy). Also, a cotton shirt is heaven in the evenings after wearing a synthetic jersey all day long.