The roll-top design 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. Thereâs a secret pocket on the outside and more pockets inside for all your tech things, and the medium and large sizes feature side bottle pockets. - No matter the length of the journey, the weather outside, or how many belongings youâre 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 laptop, you'll be able to take everything you need anywhere you go. This Medium size has two side water bottle pockets. Size: 42cm x 30cm x 12cm. - Capacity: 15 litres. - Features:Outer material: Weather-resistant recycled nylon or canvas (triple-coated)Base material: Weather-resistant canvas (triple coated)Lining material: Recycled nylon - Hardware: Galvanised, smoked, branded metal - Straps: Cotton webbing adjustable shoulder straps and wide loop handles, v-factor comfort - Zips: Sturdy durable chunky zips allow easy glide and quick opening for all ages - Vegan Friendly: Our products use no animal products