When I go hiking I like to have a spare pack - preloaded - for whomever I am going with. They get water and basic gear...to back up mine
I generally avoid going hiking we people who don't bring at least a minimal pack of their own.
On occasion I've taken rank newbies out, in which case I counsel them ahead of time on what to bring, and sometimes loan them a few items. However, that is all arranged ahead of time.