As many of you had suggested, I got a large Rucksack (Austrian Army) with a good sized "Fanny Pack" that actually attaches to the shoulder straps and hangs under the rucksack. (It's a little funky looking but it seems like it will work well)

I have packed all of the rations from the "Food Tube" into the Fanny Pack. The rations and other equipment that was in the backpack before is in the Rucksack now, with plenty of room to spare.

I am keeping the ability to "sling" some equipment although the primary plan is to carry those items in the ruck.

I will still carry the messenger bag with water bottles, licenses, log, maps, VFR charts, etc.

My long range BoB now weighs approximately 33 LBS. I will still have to depend on my "scrounging" abilities to stay supplied with food and water, and to increase my capabilities as I go (can you say bicycle, weapons, etc.)