bzn_slim wrote a review of Peak Performance R&D Backpack - 15L on February 7, 2012
Great pack overall.
First, I will describe the ski carry, because it is unclear from the pictures. The pack has a ski loop that pulls out of the bottom center. It also comes with a ski strap that can be looped through the upper left or right of the pack. This enables diagonal ski carry. It carries pretty well, despite the lack of compression straps. Padded back and waist belt are nice. (I do not understand why so many companies (*cough* black diamond *cough*) put a wimpy little waist belt on their packs, it sucks if you are carrying skis.)
This is clearly a well thought-out design with lots of attention to detail (e.g. the zipper pulls). The clam shell design opens nicely, even when skis are attached. Materials are very burly. Pack is slim and low-profile for riding chairlifts. It's very nice that all straps can be stowed, and the exterior of the pack is very clean -- there's nothing that can get snagged or caught.
Internal dividers/pockets are okay, but not great. They don't do the best job holding my four main bulky items: shovel blade and handle, probe and water bottle.