Ortlieb Single QL3 is a minimalist bag with waterproof circumferential zipper. With its 12 liter volume it easily takes a 13" laptop, DIN A4 files and all small items required for a days work such as a calendar, smartphone, etc. An organizer with two subdivided sleeves helps to keep things in place. The Single QL3 can be directly mounted to the included Tubus Minimal QL3 rack. It features integrated mounting components of the QL3 system with the advantage of clean, simplistic mounting without any excess components.