For use with the Thule InLock panel (not included) which attaches easily to almost any bike rack. Soft connection of InLock system ensures a rattle-free ride. Thule InLock panel sold separately. Protects laptops up to 16" while keeping your work or school essentials dry in any weather. Hardware-free design makes it comfortable to carry off the bike. Padded protection for laptop and organization for tablet, files, and other everyday essentials. Includes a detachable shoulder strap for added convenience. Waterproof protection, IPX4 waterproof rating with welded seams, roll-top closure, and durable, waterproof materials. Enhanced visibility, reflective trim enhances visibility from the side, front, and back when cycling