Size: 42cm x 30cm x 12cm Capacity: 15 litres. Outer material: Weather-resistant recycled nylon (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 FriendlyThe 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. There’s 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. With enough space for a 15" laptop, you'll be able to take everything you need anywhere you go.