Looking for a way to bottle in larger containers without getting into 5 gal. kegs. Was thinking of using 2 liter soda bottles, actually old seltzer water bottles. I would keep in unlit place inside brown bag to keep light off the clear bottle. I have been seeing beer recently show up in brown PET plastic bottles, but I also hear PET plastic is subsceptible to oxygen infiltration. Can't seem to find much on HB for this. Am I completely off-base and missing the obvious?