I've been carrying an earlier version of those in each bag many years. They also make guaranteed data-blocking cables cables, but getting the blocker as a dong

I've been carrying an earlier version of those in each bag many years. They also make guaranteed data-blocking cables cables, but getting the blocker as a dongle means I can carry it plus a data cable for my phone, and not have to carry 2 cables. (When I do find an unmarked USB cable that appears to be charging-only, like that came with a used phone and a firestarter wallwart, I destroy it.)