THE ORIGINAL RJAYS EXPANDABLE EXPLORER RACK BAG LITTLE BROTHER HAS ARRIVED”  Built in raincover with adjustable drawstring 100% waterproof  1800 Denier ballistic nylon  Adjustable and detachable padded, ergonomically designed shoulder strap and backpack straps  Convenient multi-purpose loops  Back Pack straps storage compartment  Highly reflective 3D logos for added visibility and safety  Slip over pocket for rack mounting with dual securing straps