Insulated Lunch Boxes for Boys Girls - Blue Lunch Bags for Kids School Sack INSULATED LUNCH BAG. Our Boys Lunchboxes features a zippered main compartment which means food stays hot or cold in the BYO lunch bag. Please use ice packs for keeping cold, not ice cubes. LAYS FLAT. When empty, these insulated kids lunchboxes and bags collapse flat so it can go into a backpack for easy transport home. Can also be used as a preschool baby lunch bag! ADJUSTABLE STRAP. These lunch boxes for girls and boys have an adjustable strap which means that it fits boys of all ages for this lunch sack. SIDE BOTTLE HOLDERS. These kids lunchboxes hold a water bottle so your child can stay hydrated. LARGE MAIN COMPARTMENT. This kids lunch box for school can hold at least one sandwich, one 12 oz drink and 2 pieces of fruit.