It is made of water-resistant fabric. our product is designed over 4 independent areas, a main compartment containing a laptop area, a 2nd compartment, a front compartment and a front pocket. each compartment of our product is supported against tearing. there is a sun-proof hydration area on both sides of our product. the back area of our product is air-conditioned. it is covered with ergonomic material that does not sweat and does not sweat. product dimensions are 44x30x18 cm. up to 15' computers can fit into the laptop compartment. the base of our product is foam-backed. Improved version for clearer understanding and better search visibility. Suitable for users seeking detailed and reliable product information.