Allpa X 4L Hip Pack OBO Color: Rust Butterfly-style opening for easy access Side release buckles for compression Main compartment two-way zipper Wings can be stowed in the back panel when traveling for easier packing Rounded corners and darts give the front pocket more volume for packing Fits perfectly inside top pocket of Allpa 35L and 42L 4L (244 cu in) 11 x 8 x 3.5 in (28 x 20 x 9 cm) 13 oz (368 g) TPU-coated 1000D polyester 840D ballistic nylon paneling Max circumference when buckled: 54 in (137 cm)