Do you run out of space/cards when on a trip? If so I would recommend moving up to much larger cards, and buy several so that you don't ever have to reformat a card and start again. If you don't need UHS-II cards then UHS-1 are very cheap, $30-$40 for 256GB for example.
Even with all data stored on cards I do believe it's worthwhile copying (never moving) images onto an external drive while on the go. If you want small and light there are a number of 2.5" SSD drives, USB powered up to 2TB. Check Newegg, OWC etc.
