Ortlieb Bike Packer Plus has received praise for its mounting system, materials and functionality. The material is very sturdy and these panniers are completely waterproof. Five year guarantee. - Welded seams - Quicklock and well adjustable attachments - easy to use with little effort - The panniers are attached via hooks that open simply by lifting the handle - Cord cinchable mouth and flap - The volume of a pair is 40 liters - Flat inner pocket with zipper - High quality reflectors front and back - Flap pocket at front panel - 5 year guarantee - Made in Germany. Weight and volume refer to a pair of panniers. The price includes a pair of panniers, by moving one item to the shopping cart you receive two panniers.