An insulated lunch bag needs be refrigerated, especially if you don’t plan on eating for over two hours. This will keep your food nice and safe until it’s officially lunchtime!
It makes sense to put your lunch bag in the chilliest place you can find. Your typical refrigerator sits at a cool 35°F, which is well outside of the bacteria danger zone. A lunch full of meat, dairy, or any other perishable foods should go in that chilly box as soon as possible!