@Irish, beyond what others have mentioned:
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we once broke our last insulin vial when installing it in the pen (-> more than one spare)
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we misplaced our main supply bag once – found it again 1/2 day later, but thank God we had a spare bag right at hand
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we were saved several times by having a Frio bag (if humidity not too high). But when it’s too humid, we use a PK2 Packit cooler bag with a couple of cooling bags in it too.
Like Eric said, don’t throw away the needles too often!
Here is a good travel thread we have had here: Travel!