Always been leary of foil, but you definitely want to allow for air in/CO2 out, so I rubber-band a thick sterile gauze pad over my flasks while they're in service. Single-use, obviously.
I've been thinking of getting some of these, which would seem to provide the best of all worlds, but the shipping costs are effin' ridiculous, so they'll have to wait until I come up with a bigger cart...
I haven't tried foil because I wouldn't want a fruit fly or something making it in. Yes/no?
kh54s10 said:Have you got a lot of fruit flies?
If you mold the foil over the mouth of the flask it would take an exceptional fruit fly to get in there.
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