When I sold my business, I treated myself to an extended stay at the Canyon Ranch, in Tucson AZ. They are well known for their hiking. Every morning, I signed up at the hiking office for a minimum 3 hr hike....some were all day. As it got more advanced, the elevations were pretty spectacular, and when climbing from the desert floor, you have to take quite a bit of water. The backpacks started to become uncomfortable on my shoulders as I added more water.
Several people, myself included, opted for the Fanny Packs that they offered...they had loops from which round shaped quart sized containters suspended.
Something tells me that the design mind of TB could create the ultimate in Hiking Fanny Packs, if he were so inclined.