I cook in my pot and eat out of it. I'd rather wash a little pot than carry dirty freezer bags.

Usually all it takes to clean it is rinsing the pot with some drinking water and dumping it out. If I'm going to have a fire, I put it in the fire pit. If not, I'll dump it in a spot where nobody will set up a tent.

I really doubt if what amounts to less than a teaspoonful of food leftovers is going to destroy the ecology. The ants will make quick work of it. That's their purpose in life.