Is your packed lunch still safe by noon? Set the hours and see

1. WHAT'S IN THE BOX?

2. HOW IS IT PACKED?

3. HOW HOT IS THE DAY?

4. HOURS BETWEEN LEAVING THE FRIDGE AND EATING

Rule of thumb, not a guarantee. Limits: 2 h (1 h on a hot day) with no cold; 4 h with an insulated bag and two cold packs.