The ORTLIEB Gravel-Pack duo is perfect for extended trips and endurance competitions, providing a combined carrying capacity of 25 liters for essential materials like cooking utensils, sustenance, and indulgences. By attaching the Pack to your lowrider bike rack, you can maintain a low center of gravity and retain uncompromised off-road maneuverability even with extra gear. These waterproof panniers use a secure roll closure and are crafted from durable PU laminated ripstop nylon fabric, while the QL2.1 system is compatible with racks up to 16 mm and includes an extra mounting hook for stability. Additionally, reduction pieces for tube diameters 8, 10, and 12 mm are included, preventing scratches and abrasions on the rack.