I have switched to sort of translucent white plastic bottles. I have a bunch of 1L bottles now because my old dog needs Pedialyte added to his water (sheesh!). These bottles are nice because they have a wide mouth, so I spill less. I squeeze the air out before capping and keep them in a dark room. No ill effects so far, but my color film tends to be funky to begin with, so maybe there is an effect, I just can't see it. I don't know how many rolls/sheets I have dev'd on this batch, but I think I mixed these back in February.