Looks like that guy is in the same situation I am in, ordered too much and want to sell some, at the same price I got.
Anyway, I thought smokeyblue was talking about the Wizardlabs concentrated flavor, the little tiny finger size glass tube, then I wonder the same question.
If you are talking about Nic, PG, VG, then you should have dark glass bottle. I just ordered gallons of them and don't have enough dark glass bottles, so I wrap the plastic bottle with black plastic bags and put them in the refrigerator.