I strongly suggest the camelbak talon. Compressions straps allows you to make it pretty small and bigger if you need extra storage place. Admin pannel on the top, molle webbing, verry comfortable and versatile. It comes with an hydration pouch who goes betwen the frame and the main compartement. From all my backpack this one is my favorite for EDC.
https://www.entrygear.com/productima...n%20coyote.jpg