Thermal Insulation System. Thicker thermal walls eco-friendly waterproof aluminum foil create a fully insulated bag so that food and drinks can be kept cool or warm for several hours. Lightweight and Foldable. Easy to clean and wash. A convenient product. Lunch Bag is quite spacious to keep lunch boxes, bottle and other things. Can be used as lunch bag, picnic bag, and sundry bag, suitable for all age groups. This is made of good quality canvas cloth for longer life. High quality metal and smooth zipper is easy to open and close.Lunch Bag is made of Tear and Water resistant Oxford fabric, which is resistant to dirty and abrasion, protecting your lunch and items inside from occasional splatters or rain.