Perfect pack. I use the bladder compartment for my Mac. A pair of shoes fits perfectly in the helmet stow. And the large compartment fits up to five outfits for a weekend getaway. On the trail or camping its perfect for a two day trek.
  The material is light but strong the straps are very comfortable under a load. My only gripe is I the chest strap clamps slide off at the bottom because the piping works it's way up into to top of the straps. . I sowed mine in place and they stay now.
  I highly recommend this pack. Worth every penny.