Pros: The pack is good - small and light. Chest and waist straps keep it from bouncing around (I use it while biking). Cons: Bite valve leaks badly. My older High Sierra's valve lasted several years before going bad. Seems the quality went down.
I had never purchased or used a hydration backpack before using the Hydra Hike 4L on my recent trip to Utah. I liked the size of the pack and it’s was comfortable to wear. The space to carry stuff is quite small, but adequate for most day hikes. My only issue is that the actual reservoir is 2L vs the 4L indicated. Not sure if I missed something in the details when I purchased, but I would have preferred a 4L reservoir.