N.K.
Raw veggies with ranch dip, gluten-free crackers with hummus, cold cuts, gluten-free crackers with cheese dip in between them (like a mini-sandwich). Also, my kiddo loves these dry snap peas with seasoning: https://www.target.com/p/calbee-harvest-snaps-caesar-gree... so that's another idea.
You could also add other things like Fig Newtons, raisins, dried cranberries, dried apples...I was going to suggest trail mix until I remembered most trail mix has nuts, and could be a hazard for kids who have allergies. Vienna sausages may create an issue for some parents, but maybe cubed fruit (watermelon, cantaloupe and strawberries) would be fine.