Great bag, I'll try to explain the zippers
Osprey quality, all the bells and whistles you would want. I've carried skis, a snowboard, and snowshoes, no problem at all. I've even A-framed a pair of skis and attached a snowboard at the same time. Albeit a bit heavy, it works.
Here's what I fit inside the bag for a week of resort and sidecountry in the Rockies, and some backcountry: 3L camelback, 2 extra shirts, 2 extra gloves, 2 extra socks, food, goggles, with plenty of room to spare. I haven't packed true avy gear yet, but there would be no issue getting a shovel and probe in there.
Pockets: dry and wet pocket, wet pocket has a drain grommet at the bottom which is a nice touch. Dry pocket has plenty of space for clothes and other stuff. Small pocket on the front for wallet, keys etc. Hip belt pockets for camera, chap stick etc.
Zippers and clips: The clips are good, strong Osprey quality, and the compression straps have a dual locking mechanism to keep your straps secure. Here's where the pack losses a star, similar to what some of the other reviewers have said, in order to get into the pockets, you have to unstrap/unclip the straps. It's almost as if Osprey made a mistake and put the compression straps on the wrong side of the pockets. So let's say you have your pack on and compressed, skis on your feet. You need to unclip the compression straps to get into the pockets. If your skis are attached, you need to loosen the compression straps, then retighten them. To me, it's not a big deal as I really need to get in my pack a few times per day. But if you are going to be constantly going in and out this could become annoying. On a positive note, one of the zippers has an elastic zipper pull which is a nice touch.
This pack could easily be used as a day pack or really anything else you need a backpack for. It could be considered heavy for a daypack, compared to something like the Talon.
I looked at the BD Avalungs, and Gregory Drift and I went with Osprey because of Osprey's quality (I have 3 other Osprey bags) and because of the added features that the Avalung doesn't have.