Just empty, collapse and freeze the entire lunch box overnight (12 hours). By morning, the walls of the bag will be completely frozen and ready to chill. This lunch box keeps food cooler longer ...

I talked to caterers and chefs, who recommend keeping these factors in mind when shopping for ice packs: Below, I rounded up ...

Ms Tricks argues it is usually both healthier and cheaper to make a packed lunch, but the charity is also encouraging people to pop a plastic box in their bag alongside their reusable coffee cup ...