Ortlieb says about the Handlebar-Pack QR
Waterproof handlebar bag with Bar-Lock cord attachment system (QR - Quick Release). Quick access to content via roll closure with hook: compatible with drop bars handlebars: 2 flexible outer mesh pockets: internal and external compression: PU-coated nylon fabric.
Accessories available separately: Handlebar-Pack QR Inner Pocket (F9924)
Note: not suitable for carbon handlebars.