Probably from the 70’s, as I was born in ’79 and this is an early childhood memory. I have been trying to find for years:
Illustrated story about a boy and his father (or father figure). I think the father gives the boy a bag of something edible (blueberries?) to hold as they journey on foot. The boy walks behind the father, and as they go (through at town at one point?) the boy eats all of the contents of the bag. When the father finds out, the boy gets a mild scolding. The boy ends up with the empty bag over his head at one point, and I think fills the bag with air and pops it at the end. The story might start out with the father/son picking the (possibly) blueberries, or buying them…
Could be part of a collection, or rather short standalone book. In my mind, the illustrations remind me of Maurice Sendak.