Material: Nylon Opening method: zipper With or without liner: Yes The internal structure of the bag: zipper pocket, mobile phone bag, ID bag, sandwich zipper bag, computer pocket Function: Breathable, waterproof, wear-resistant, anti-theft, shockproof, shoe storage, lightening Applicable gender; neutral/male and female Applicable product types: notebooks, tablets, iPads Bag size: large Whether to bring a lock: Yes