OK, I'll be a revisit contrare (not sure that's a aword, but it sounds good).  I like the two 30s packed inside a kondos pack.  Reason: 1) It is easier to find what you are looking for if you pack the barrels strategically  2) It is easier to wrestle two smaller barrels than one larger.  3) Two barrels mean two seats in camp. 4) In camp (if you stash), 'stash' your barrels apart at night.  If the bruin gets barrel "#1", you'll most likely still have barrel "#2" that he never saw.   :)