20-liter waterproof pack bag designed specifically for the Specialized/Fjllrven Cool Cave pannier (art.no 23234). Made from waterproof recycled nylon that, together with the roll-top closure and taped seams, reliably protects your gear in wet weather. Valve to release air so contents can be compressed after the bag is closed. Part of the Specialized/Fjllrven series for urban rides and bikepacking adventures.