waterproof and shockproof 15-inch business and travel computer backpack black and gray

vertical square: don't worry about wrinkles due to random placement. the backpack is three-dimensional and square, easy to clean and not easy to deform. s-shaped decompression shoulder strap: the bionic s-shaped back shoulder strap design refuses to bring additional burdens to you, making you more relaxed. anti water splashing design: there is no need to worry about damaging the contents of the bag due to water, effectively protecting important items from damage. comfortable and simple: the back and shoulder straps are designed with breathable sponge mesh, which helps to convection, ventilate, and dissipate heat, as well as relieve shoulder pressure. suitable for multiple occasions: a computer backpack that can be used for school and travel..syi