Premium Material The exterior of the isothermal cooler backpack is crafted from 1680D Oxford fabric, which is waterproof, stain-resistant, high-density, durable, water-resistant, and easy to clean. The inner lining consists of a PEVA sheet, packed with 8mm thick EPE foam for high heat resistance. Multifunctional Pocket This insulated backpack features a large opening for convenient loading and unloading. It includes side mesh pockets for a water bottle and umbrella. The bag's lid has a separate 5L waterproof compartment for snacks; there are two front pockets for utensils and keys, a tablet, and more. A mesh pocket with a shoulder strap is available for your cell phone. The multi-pocket design allows for easy classification and organization of items. Large Capacity The picnic bag offers 28 liters (45 x 30.5 x 20.8 cm) of spacious storage capacity. Whether you're organizing an outdoor picnic for the family, packing lunches and snacks for the kids, preparing cold drinks for an event, or gearing up for a camping barbecue, this multipurpose waterproof and insulated backpack is an essential companion. New Craftsmanship The thermal insulated backpack has transitioned from traditional folding sewing techniques to employing seamless hot stamping technology to bond the inner lining and ensure superior water resistance. The arched opening design helps prevent spills from dirtying the bag due to bumps during transport. Portability Equipped with padded handles and adjustable shoulder straps, the design offers multiple carrying options for easy transportation. Utilizing mesh foam and widened shoulder straps enhances comfort when carrying multiple items, alleviates fatigue, frees up your hands, and makes walking easier.