Here's what I have in a backpack for "on the road" serving/cooking. Not camping. In case of bringing stuff back to room or whatever accommodations. The backpack I use is just a standard school size backpack that was laying around. I just toss it in the vehicle when a trip comes up. We do roadtrips quite a bit and sometimes aren't near restaurants that interest us. Especially if the only choice is Applebees/Chilis/Olive Garden etc. Or it we've found something good on the road and want to eat it later, like finding a great BBQ place but at the wrong time.
Silipint bowls and cups, easy to clean, can be used as cooking vessels.
A pair of metal tongs. (these are invaluable)
A couple serrated steak knifes, for eating and prepping.
A couple sets of real flatware, not plastic
Plastic serving spoons/ forks/tongs poached from catering events, usually disposed of, but sturdy for light reuse.
A flexible cutting board.
A spatula and pie cutter (for side of the road pie places)
A wooden spoon
Victorinox peeler (for using roadside produce)
A couple empty plastic takeout style boxes in case of needing to store something.
A small box of zip-loc style bags.
A couple kitchen trash bags.
A couple wooden steak plates for dinnerware (I picked up a set at Goodwill for couple bucks, they are super useful)
A couple of smaller empty reusable water bottles.
a few more things I just can't remember right now.
Individual salt and pepper packets.
Small bottle of hot sauce.
Napkins + papertowels + wet wipes
We also bring our own tiny vacuum coffeemaker and coffee, which is VERY Important, VERY. It's got its own special bag.