I have mission critical data that needs to travel well, so the plan is to have copies on two flash drives in case one fails. Cloud storage is not an option.

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Needs to have very high quality memory chips, and be very resistant to the elements, shock, water etc.

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I don’t need a ton of storage, 16gb is fine and I don’t care much about the speed. Price is not an issue.

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Whats the best out there?