Ergonomically profiled back padding takes the pressure off of the spine and advanced air-mesh to promote superb air channeling to improve comfort while riding.; Multi-material Outershell : Light-weight 420D Nylon / 420D Ripstop Nylon to reinforce the bottom part 25L Capacity (approximately) 2 external waterproof pockets on front Computer compartment with full length zip featuring 15" laptop protective fleece sleeve Large main compartment with internal organizer featuring a smartphone protective fleece sleeve Built in helmet carrier Rain cover stored in its pocket in the main compartment Ergonomic shoulder belts with perforated foam padding and mesh panels for an optimized airflow, adjustable and removable sternum strap and the Alpinestars quick release system for a fast and secure adjustment, preventing the extra webbing flapping Ergonomic 15mm back padding YKK semi auto-locking zippers for a secure closure Reflective details on the front and shoulder belts to improve rider's visibility in varying light conditions