Like any modern couples, we have 2 smartphones, and instead of playing "musical charger" (as opposed to musical chairs), we have the ability to charge our 2 devices simultaneously! No jealous!
It is very practical and almost indispensable during trips (long or not).
It is rather design. No problem when the double burden of phones.
This small object is therefore indispensable part of my holiday.
I fully assume my phone is an extension of my arm, so I can do my crâneuse with my battery recharged when I go out of my car.