J.M.
A few ideas:
- String cheese (single serve packages keep well in the backpack)
- BabyBel brand cheese (in single-serve round red wax covers, long shelf life)
- Sunflower seeds - my 20 month old loves them
- Granola bars
- Yogurt (can stay good in backpack for a few hours)
- Milk - in the summer months she'll need more fluids, and I struggle with getting my 20 m.o. to drink enough when we're out and about)