This 'touring' bike is packed for a 6 day, 2100 mile trip.
All of the maintenance and repair gear is under the hump (tools, compressor, jumber cables, tire plug kit, spare straps, zip ties, multi-meter, fuses, tape, ball-end allen set, vise grips, etc.). There is a lot of room under there.
The 20L dry bag contains all the clothing... only clothing, packed neatly. This is how you get it full and firm. (That's what she said) Pack it neatly. No shoes or other odd shaped stuff.
The tank bag contains running shoes, spare visor, 2 extra sets of gloves, bathroom supplies, chargers and wiring, several packs of ear plugs, maps, pills (Advil, etc.), reading glasses, visor cleaner, camera, rain pants, rain liner (for jacket), and other small odds and ends.
The dry bag is easy on and off, and it expands up or down as I add or subtract stuff during the day (fleece, heated liner, etc).
I get a lot of compliments on this compact and efficient system. The bike remains very streamlined.