How to attach your UNITgarage side pannier?

https://www.unitgarage.com Side pannier made by hand in Italy in top quality waterproof waxed canvas & waxed suede. Simple and pure with beautiful details in 3mm thick leather trim. It attaches easily to our sub frame with the quick release system Cod.U000 already installed on the back of the bag. With the included key the quick release system can be closed, locking the bag to the frame. It is big enough to easily fit a 15" laptop, and is equipped with a large zipped pocket on the front for easy access to your phone and documents. Measurements: 32 cm Height (extendable in height up to 45 cm) width 24 cm depth 13 cm (from 10 up to 14 liter)