Ah, thanks, Sailor...that was what I recall you saying but somehow I spaced it in practice, probably to the detriment of my cultures. I'm not talking about childproof caps but twist on bottles, but probably the same result. John@PC uses smaller foil pouches, I imagine zip lock. Can you tell me where you source the nalgene bottles, Sailor?
Thank you, by the way, Pete. I've had terrible luck with vacuum sealers' durability, but I'm sure that's the best way. Under advisement, thanks.