After much research, soul searching, and trying of gear I finally decided on my set-up. I went with a traditional ALICE LBE with buttpack and 2 canteens. This is in addition to my trusty M3 Unit One aid bag which I knew all along I was keeping.
I function as medic for our team members as well as for victims, so I always pack more med gear than your typical SAR member. So far, the buttpack holds the gear I typically carry although I am upgrading to published NASAR Sartech II gear list. The straps can hold bulky items if the need arises. There is also mounting points for accessory pouches if needed. I'm going to carry only 2 canteens (with cup and stove) for the time being but I may add more. After some training runs and/or call-outs I'll write more.
As some mentioned, I really liked the TrueNorth gear. Unfortunately, it is out of my price range at the moment.