The Canfield B is weather resistant, durable and sleek, making it perfect for anywhere your day might take you. The roll top design enables a wide-mouth opening, complete with a zip and a magnetic hold and so you can fill this bag to the brim worry-free.A secure and innovative closing feature, secret wallet pocket, and chunky zip come together to create a secure and trendy backpack. No matter the length of the commute, the weather outside, or how many belongings you’re toting, the Canfield B is the ideal travel accessory. If your laptop or tablet is a bit larger than the Medium Canfield B is perfect for you. With enough space for a 17" laptop, you'll be able to take everything you need anywhere you go. This size has two side water bottle pockets. Details, details, details. Each medium bag is 42cm x 30cm x 12cm. Capacity is 15 litres. Outer material: weather resistant matte nylon (triple coated) Base material: weather resistant canvas (triple coated) Lining material: matte nylon Hardware: galvanised, smoked, branded metal Straps: cotton webbing All of Roka's products are vegan. While Roka bags are washable, usually a simple wet sponge does the job. The materials used are designed to be durable and weather resistant. And the straps will become softer and more comfortable with each use.