This is a Zojirushi insulated lunch box set. It includes a stainless steel insulated lunch box, two containers, and a bag, making it convenient to carry. As it's Zojirushi, I believe the heat retention is high. The white stains on the containers are not food residue. I think it might be melted silicone from the silicone cup. The inside has been cleaned thoroughly. There is overall wear and tear, but the bag is clean. Would this be suitable for someone who doesn't mind the condition? - Brand: Zojirushi - Included items: Insulated lunch box, two containers, cooler bag - Materials: Stainless steel, plastic - Size: The containers are standard size. - Colors: Black, silver Thank you for looking.