Yesterday I went for a long walk and got a few ideas for water bottle holders made out of recycled advertising tarps. Here's my first prototype all set for a field test. I put a shoulder pad out of chenilled fabric. After my walk I should be able to discern if there needs to be any adjustments to the design.
Update: the prototype works well. Apart from making a larger shoulder pad I'm pretty happy with the design. I like how it sits low on the hip.