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I have a gregory baltoro 65, and it's the best pack I've ever had. I use it for multi-day trips.
For a day hike I just take a camel back with my cook kit and water bladder, and some shit attached to my belt like first aid, camera, etc. If I needed more room I'd probably just take a book bag for a day trip.
Any multi day pack will be extremely overkill and try hardy for a day hike.
What did you take on a day hike before delving into the consumer world?