I've taken this pack on a couple day trips now and it's done a great job! It carried all my gear in and out of calico hills, and to and from the crag at home. I fit a 3L water bladder in there with gear no problem. I'm starting to wish the lid opened the from the front, but it doesn't ruin my day. Tons of pockets and places to stash things like keys, snacks, lip balm, and the guidebook for easy access.
I'm into Gregory packs right now. This was my first Gregory pack (a few months after I bought this one, I bought a bigger one for overnights. Love that one too.) I use this to haul my sport climbing gear and snacks to the crag. It's comfy, has a place to hold water, and fits way more inside than it looks like it should. AND the XS size actually fits me, so if you are a small woman who has trouble finding packs that fit, check out the Gregory packs. Overall, this is a great day pack.