I have this bag and love it. I bought it after I helped my buddy pick it out as his day bag and school bag. Then I promptly went out and bough one. My friend Krys was with me and loved it so much that she bough one for her husband. This is my go to woods, hiking, day, bouldering, book, overnight at a friends house bag. I love this thing it will hold a good amount of gear more then enough for a long day including a first aid kit, survival kit, rain coat, a light fleece, lunch and other odds and ends. That is my usual load out for a long day hike. It comes with a 100 oz bladder and I have loaded up the entire pack and bladder and put two water bottles in the pockets. This really is a great pack. One of the other great things is the sternum strap. This strap has a built in elastic section so that you get much more freedom of movement when scrambling around off trail or climbing trees or rocks or whatever. Also the buckle for the sternum strap has a built in whistle so you are never without one.
I have a couple of less then desirable features. First off the hip belt isnt that great and it comes off. This is great if you are carrying a belt knife or use the belt to keep the pack from moving around to much, but if you want to use it to take some weight it just wont cut it. This is not a big deal for me since I usually try and run as light as possible. Also I really like a top loading pack, but that is just a personal preference. Oh and even if I get another day pack that is top loading this pack is going nowhere. Also I wish that there was more organizational capabilities, but this is an issue that I have with all packs, the Rim Runner has the normal amount of pockets and such. Also there is a fleece lined electronics/sunglasses pocket at the top which works great for an iPod or sunglasses, imagine that huh. the issue with this is that it does not have a water tight zipper on this pocket so I have had water get inside the pack. This was only on a very long and wet day but still something to consider.
All in all I love this pack and would highly recommend it to anybody. Let me know if you have any more specific questions or want to see any pictures of mine, I don't have my camera handy right now.