Stainless steel ice pack.
100% non toxic.
The body is made of 18/8 stainless steel, and it is filled with distilled water.
Safe to go right into your container, next to your food.
It freezes solid in about 2 hours, and will keep your lunch cool for 4-6 hours, depending on your containers and your lunch bag.
It is also perfect for sore backs, headaches, bruises, bumps…