The Rear Rack Pack II's roomy main compartment features an expandable zip-open baffle, that provides extra volume. There's also a side-opening pocket in the top flap and 2 roomy side pockets for organizing your gear. The 5-point attachment system secures the load and padding on every wall offers insulation and protects your cargo. The pack is made of water-repellent fabric and sports straps for securing a pump. Plus, Scotchlite Reflective Material across the back ensures you're safe at night and doubles as a taillight holder.