The outside of the insulated lunch box is made of oxford cloth and the inside is made of aluminum foil, heavy duty metal zippers which will minimize the possibility of broken zipper. The shoulder strap can be removed. The lunch box can keep foods and drinks cool or warm for hours. The cooler is perfect for on-the-go meals, picnics, road trips, lunch at the office, the school and the beach. Modern and lightweight design is convenient to be used as your lunch bag, cooler bag, picnic bag, sundry bag or shopping bag. Hand these out in your next promotional event and make a splash among your customers! Note: There is also smaller size of this bag available.