In Ortlieb Back Roller Classic Pannier bags you can save what you need for your bike tours and weekly grocery-shopping ventures. The waterproof roll closure ensures safe and waterproof storage of food and equipment. High quality, resistant, visible and waterproof. And with a capacity of 20 liters each.They also come with bright reflectors made of 3M Scotchlite reflective material, on both sides of the bags, to make you more visible. If one day you don\'t need to carry both saddlebags, you can easily remove one, and take only one on the bike without a problem. Also includes a shoulder strap to take your pannier bag wherever you want. With the Quick-Lock2.1 system, the bags attach to any bike rack with a tube diameter of up to 16 mm