This was an original bonus tip from one of my prior postings (#4): Avoid buying fruit cups and individually packaged food items. For my homemade fruit cups for my daughter's lunch, I pack her sliced-up fruit, grapes, mandarin oranges from the produce section, a large can, or frozen fruit (like blueberries) that can defrost by lunchtime. I buy animal crackers and pretzels in bulk and put them into re-usable 4oz. containers.
Everyday, my daughter gets all natural applesauce in her lunch. I don't buy the individual servings. I buy the biggest jar I can find, then sort out portions into 4-oz. containers.