The side of the kpop backpack is equipped with a USB and audio cable interface, we provide a USB cable and audio cable, please check and use it correctly.The main material of kpop backpack is canvas, which is waterproof and oil-proof, with better breathability and durability.20-35L capacity, designed with a separate laptop bag side mesh bag, can accommodate a 15.6-inch laptopThe front pocket is suitable for small objects, beautiful and convenient, large-capacity loading, to meet all your needs, compact body, can meet all your requirements for work, school, travelExternal USB port and headphone jack portable charging, function Walkman music, external connection with headphones, always keep charging, internally connected to your own mobile power supply, externally connected to your own USB, easy and convenient cable can be used for mobile phones Charge