A notepad with to-do plan lkst for the place you are going to visit. (though i know mobile phones have been dominate, but still if anythings with phone). A first aid box with some medicines used commonly.
I still carry a notebook with itinerary details, phone numbers and printout of tickets as well as hotel vouchers. You cant trust your mobile always especially when roaming around remote areas where there is frequent power shutdowns.
These days I m not taking my camera bro. Using mobile to frame the moments if necessary. Carrying a camera often distract me from the very basic purpose of travelling as I m not a passionate photographer :)