Granite Gear Echo Backpack Fabric Repel weave Fabric with Taurolite Bottom High Density Foam Shoulder Harness Fully Padded Back Panel Adjustable Compression Straps Lash Straps for Easy Attachment Stretch Mesh Hydration Pocket Gear Tech Computer Sleeve fits most 15 5" Laptops Multi Pocket Organizer 1725 cubic Inch 18.5"x12"x7.5"