Osprey Manta 34

Osprey says:
With 34 liters of volume, this Manta is a premium hydration daypack designed to offer outstanding, fully-featured performance without compromise. Made to go the distance on your most committing hike adventures, it has loads of storage and organization, all packaged in top-tier sustainable fabrics. Its highly-ventilated AirSpeed(TM) suspension has been improved with a molded ladder torso adjuster and it comes with the next-gen Hydraulics reservoir.