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hi crex,

i think for that small plastic vials the name is Eppedorf tube (at least in romanian... a direct translation... where is the case).

my oppinion is that this are very good for keeping. but one advice... not keep beetle or anything else without alcohol for to much time. otherwise there will develop a lor of mold (i'm telling this from my experience).

just collect and trow the fly/beetle/other insect (except butterflies) inside.

hope this helps you,
cosmln