This brown lunch bag is very easy to open and close. When the bag is empty, please flatten the bag, put it in your bag or other places without occupying any space. No matter the food is warm or frozen, 3mm upgrades thicker insulated pearl cotton aluminum liner insulating interior lining can keep food fresh. Impermeable lining can avoid any problems caused by possible leakage of food. Simply wipe down with a damp cloth and you've got a new, clean lunch bag. (Note: Prohibition of machine washing) Brown paper reusable bags not only eco-friendly, but also durable which can be used for a long time. Perfect for women, men, kids to carry food and drinks to work, school, picnic, camping, kitchen, beach.