I posted a vest link above. If you want the full front instead of the strap front they have that for about 10 dollars more. The water bladder actually fits in a pouch on the back. 1gl of water. Then a few hand fulls of ice and it will stay cool half the day in 100° heat.

As far as paint to air consumption. I can squeek 1200 rounds out of my 68 45 tank. Since that is a max number I Cary short of that in paint. If for some reason I run out and still have enough air to do anything I borrow a pod or handful and that gets me through just fine.