I love this pack! I just bought my 4th one and have been using this pack model for 6+ years. The quality is excellent and lasts for years, but with several rides per week, I like to buy a fresh new color every other year or so.
It holds all I need for longer days in the saddle and is light enough to be comfortable on a short lap. It fits my shoulders nicely. The pockets are very organized with a phone zip pocket on the top. It expands for holding all you stuff on long days and can be tightened up for a light load. I have to say, it saved me a some bruises once too when a surprise OTB put me on my back. :)
I have tried some other models and still call the the best pack on the market.