I love my ULA-Equipment Relay. I use it all year for day scrambles. It does not have a hydration pouch, which I don't use, anyway. In the winter I have been able to pack an avy probe and shovel in the outside pouch, my ice axe, and strap on snowshoes and helmet when I don't need them. I always carry a home-made tarp, a bivy, extra socks, rain gear, a Patagonia Micropuff parka, wind shirt, and a ziplock bag with all the little bits of junk I need to carry - headlamp, sunscreen, bandanna, sunglasses, first aid, etc. In the winter the pack will weigh 13 pounds, which includes food and water. In the warmer months the weight is usually below 9 pounds, again including food and water. Did I mention I love this pack?
Edit: I forgot to mention I use a GG 1/8" pad folded up as a "frame" against the back.