I got some of the Ortlieb bags, and had a "pretend" load up for a trip at the weekend and a ride-out.

I basically cribbed JMo's idea of a Rack Pack (31ltr) and a 35ltr Dry Sack.

ALL my camping gear went in the Dry Sack...JUST! (ideally the next size up would be better)
(Tent, footprint, mattress, sleeping bag, pillow, cooker, 3 pans, washing-up stuff, gas cannister, oil and coffee, mug, plate, knife and fork, lantern, etc.)

And my clothing including hiking boots went in the Rack Pack easily. (4 t's, 4x underwear, sweatshirt, thermals, wash bag, towel, trousers, etc.) with room for a jacket I think.

So, I now have a fully-flexible luggage system, with those bags, the panniers and top box. I can now carry so much more!!!!!!!!!!!!!

I had a ride with it loaded up like this, and it wasn't as bad as I thought it would be. I don't think its all THAT heavy.....I put the heaviest bag on the rear seat.

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2008 XTR Mods : DNA Stage 3 Airbox, PC111, Carbon Cans Ovals, Steve Ruth built XTR734cc Big Bore with - High Desert Dyno (HDD)/ Cuervo Racing Gas Flowed / Ported Head fitted with +1mm Valves & uprated Springs, HDD 5050 Camshaft, HDD +3mm Throttle Body, CP 105.5mm 11:1 Piston, Custom Mapping, Piasini ECU, Renthal 613-01, Barkbusters VPS, Pivot Pegz, Touratech Bashplate, Foam Grips, Kev's O2 Sensor Mod, Kev's Extra Coolant Cooler, Wilbers Progressive Fork Springs and Rear Shock