"Perfect for a daypack or mountain biking"
I use this all the time when I don't need a lot of stuff with me, maybe a rain jacket, water bottle, and some snacks. I only use the bladder when I'm hiking or mountain biking. This pack is perfect for trail riding. It is small and compresses very nicely to stay close to your back. The bladder is very easy to wash out and dry with the tabs that fold down and the detachable hose. The space between the "harness" or front pocket is perfect for shoving a jacket or small bike pump in. The front pouch is more than roomy enough for whatever else you might need while biking or hiking. Overall a great daypack.