I own the Mountainsmith Approach 3.0 daypack. I have had it for a few years and love it. I like the pocket configuration. In addition to the main compartment, it has two vertical side pockets, a front pocket, and a verticle front pocket. It has a pocket for a hydration pack and two outside pockets for water bottles that are canted forward so you can remove and replace your water without removing the pack. There is an expandable space between the front pocket and the main pocket . There are straps across the bottom so you can lash on a sleeping bag or your jacket. Daisy chains on the shoulder straps and the bag itself to attach more stuff. To top it all off, the sternum strap has an integrated whistle.

Oh, and customer service at Mountainsmith is fantastic. I broke the hip belt latch by shutting it in my trunk. When I emailed Mountainsmith asking where I could buy a new one, they sent an e-mail back saying that one was in the mail. It arrived a week later, no charge.

Great bag, great service.