The roll-top design of this weather-resistant recycled nylon/canvas (triple-coated) bag enables a wide-mouth opening, complete with chunky zip and magnetic holders and so you roll it over to cover the zip or leave it unrolled if you need to fill this bag to the brim. There ia a secret pocket on the outside and more pockets inside for all your tech things, and features a side bottle pockets. No matter the length of the journey, the weather outside, or how many belongings you are packing, the Canfield B is the ideal travel accessory, commuter bag, school bag, and super practical backpack. If your laptop or tablet is a bit larger the Medium Canfield B is perfect for you. With enough space for a 15 in. laptop, you will be able to take everything you need anywhere you go. This bag has two side water bottle pockets and is made from weather-resistant recycled nylon or canvas (triple-coated) with galvanized, smoked, branded metal hardware. Measures 16.5 x 11.8 x 4.7 in. Capacity: 15 liters.