well at campaign i saw smartparts selling a 15 pot pack!! (that must weigh some wen full)
But back to the serious side of the thread.
i had a jacko, and hated it. They arent built brilliantly, and when full tend to tilt away from the body, putting alot of pressure on the bottom of the spine. and they seemed a tad too tight on the pots.
Rase, and Dye do some nice packs, they are comfy and well supported.
but ive just invested in a 3.2 redz dimension at campaign, and i am glad i did. Redz (i think) are the daddys of battle packs. they are comfy thanks to the support belts, and once on that paint aint going nowhere.
the standard pod loops are loose enough to let the pots fall out when the strap is released (so no more opened lids when needing paint) and the loops are velcro'd out of the way when not used.
only draw back is the price. i spent £60 on mine. (i think its worth every penny) but some jsut want something that holds pots. and thats a bit steep.
have a look at other peoples kit, try it on, and see what you think.