"Every mode of transportation we're used to ... they're all reusable, but not rockets, " Musk said.

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Reusable bags are not just used to tote food, and rarely are meat and vegetables separated (meat being an especially good medium for bacterial growth).

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The fear was that the infective prion agent of vCJD was not completely destroyed by normal sterilisation of reusable instruments.

BBC: surgeon

If you went to a fast food restaurant and purchased a packet of fries and a burger then the fries can be placed in a free bag as they are only part wrapped and you would not be expected to place these in a reusable bag as there could be some food safety risks.

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It is not a one-time expense because our filter is reusable.

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