Convertible ( Expansion gaining another 12cm wide with Ventilation ) Reinforced handles All-over waterproof polyurethane material Rear small pocket with zipper for wallet or cell phone. Front with theal compartment Internal compartment 100% Waterproof Main zippered pocket with laptop compartment Customized Print BLACK ARMOR Mesh side pocket Inside mesh pockets with multifunctionality Ergonomic back panel with optimal ventilation Material: polyester with matte finishing Dimensions: 45.0 x 57.0 x 25.0cm ( Expansion more 12cm - total 37cm ) Side pockets for water bottles Handle with soft touch