doing it this way is bad, everyone is only gonna recommend the packs that they use. your best bet is to try on as many as you can, as long as they fit ok and when you fill 'em with paint they dont end up round your ankles you'll be alright.
i use a raven 11 pod pack which is comfy (with the lil lumbar pillow supporty thing) but when its full you almost need braces to keep it up! and no i ain't that skinny
but a little expensive(i got mine 2nd hand) I also have a good 'ol Jacko 5 pot pack, nice, a good lot of velcro so is nice and secure and you can easily add x-loops to increase capacity.and not too expensive either if memory serves me right.
try 'em and see mate.
teebs