BIGGDESIGN HEAT INSULATED BACKPACK: Biggdesign Moods Up heat insulated backpack enables hot or cold food/beverage transportation, maintaining the temperature for up to 6 hours. These thermal bags have been developed with special technologies to protect the food from environmental conditions.WATERPROOF QUALITY MATERIAL: Due to the polyester and Oxford fabric, food grade PEVA material, the cooler bag is waterproof. As well as being impact resistant, in case the liquids inside spilled, it is leakproof and easy to clean. Please do not use washing machine.FUNCTIONAL: Via a zippered compartment on the front to place items such as mobile phone and tablet, and side pockets that can hold drinks, it is erconomically designed. Padded and adjustable shoulder straps provide comfortable use.STORAGE CAPACITY: This insulated lunch bag, measuring 11.4x5.9x15.5 inches, stands out with its large capacity (19.1 L). It is useful with zippered front compartments that facilitates organization, and two-way main compartment zipper allows easy opening.MULTI OCCASION USE: At work, camping, at the beach or at a picnic... Biggdesign cooler bag, which men and women can use wherever they want, have been developed without compromising on freshness.