MindShift FirstLight 30L Backpack with Hydration Specifications: DimensionsExterior Dimensions: 12? W x 19? H x 8.7? D (30.5 x 48.3 x 22 cm) Interior Dimensions: 11.2 W x 18.1H x 7.1? D (28.5 x 46 x 18 cm) Front Pocket: fits up to 15 laptop Weight: 5.4lb (2.4kg) Volume: 30 LitersMaterialsExterior: For superior water resistance, all exterior fabric has a dura ble water–repellant coating; the underside of the fabric has a polyurethane coating. It also has the highest quality abrasion–resistant YKK® RC–Fuse zippers, 420D velocity nylon, 420D high–density nylon, 1680D ballistic nylon, 210D nylon, 320G DuraStretch mesh, nylon webbing, 350G airmesh, nylon webbing, 3–ply bonded nylon thread.Interior: 210D silver–toned nylon lining, belly–o mesh pockets, high–density closed–cell foam, PE board reinforcement, 3–ply bonded nylon thread.