if this helps you could cut out some ply wood to the size you want the get some u- bolts and bolt it on to you grab bar to make a rack then dill spme holes or slits into the wood so you can hook some bunges to it. ill draw a picture if you want. B)
Hey I have a good idea for a small bag, and it works great for a "real" tool kit as well as a flat kit. As for water buy a Camel Back it is very handy to get a drink without stopping everytime. I will have a picture tomorrow of the bag suggestion that works for me.