I picked up this pack for when I go out on longer rides, and for when I vacation in Moab, UT later this year. I chose this pack because I have been so impressed with my smaller Dakine Session pack that I picked up a couple years ago. Quality, function, and form are all top notch! The whistle on the chest buckle is a nice feature. My dog loves it, as it gets her attention instantly. Could be really handy when I'm out hiking with her. I will be posting a picture soon to show the interior details of the pack.