Stylist Notes Constructed from a recycled polyester-blend canvas, the unlined Kickflip Backpack is a water-repellent style. It features both mesh and zipped side pockets, and fastens with a two-way zip closure. The shoulder straps and back are padded for a more cushioned feel, while buckles throughout and elastic board straps on the front offer extra functionality. Carhartt WIP Kickflip Backpack - Lumber