To keep your food colder for longer, we recommend
using a reusable ice pack and placing it next to any perishable
items to help them keep cool.
Other tips include:
Store your lunch box in cool or shaded area if you’re outdoors, away from direct sunlight
Limit the number of times you open your lunch box as each time you do, cold air escapes and warm air enters
Pack frozen items like yogurt or fruit to help keep everything cold as they thaw