I've been using the following for my Trek 7.3 touring setup.

Arkel Dry lites on the rear
Ortlieb Frame Pack
Ortlieb Handle-Bar Pack & Accessory Pack
A pair of Revelate Designs Mountain Feed Bags
Revelate Designs Mag-Tank
Revelate Designs Jerry Can
A pair of Salsa Anything Cage HD's

So far, I've been tickled with the ability to carry just about all you can want honestly.

- Cpt. Bob