I have a Crumpler Pretty Boy 3000 (L) which happily contains a G9 + Lensmate attached and both the Canon WC-DC58B and TC-DC58C (both with Lensmates attached); the G9 sits on top of the wide converter lens (it's the shorter of the two). The front pouch on it holds a spare battery, a filter stack, Raynox DCR-250 macro lens, cable-release and adaptor, and cleaning cloths. The whole lot weighs next to nothing when it's on my shoulder and makes a great travelling rig, coupled with a lightweight National Geographic/Manfrotto NGTT1 tripod. Of course the quality isn't as good as my Pentax DSLR kit, but (even including tripod) it weighs a heck of a lot less.
Alun
PS Crumpler model number is for the EU -- they're different elsewhere.