The bikepacks of the bookpack world.  These Deuter bikepacks are constructed along the same lines as our bookpacks.
Details:
»   Airstripes back system
»   Ergonomic shoulder straps
»   Chest strap
»   Detachable hip belt
»   Compression straps
»   Large folder compatible main compartment (takes two A4-sized folders)
»   Flexible repositional dividers in the main compartment
»   Security inner pocket
»   Organizer front pocket
»   Mesh side pockets
»    [2] Helmet flap
»   3M reflector