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If packed in a vial (tube) I assume you pack one fly and stopper, one fly and stopper etc or could you put several flies together between each stopper?

The question about alcohol percentage has been discussed before, I think ... somewhere. I guess the flies should be put in alcohol as soon as possible. How long can you store it in alcohol before sending it? Let's say one collect flies during a period of time and plan to send a bunch at once later?