The pack attaches to any bicycle rack with straps from below. It can be used as a messenger bag, with the included shoulder strap. It also has a convenient carry handle. Backpack straps are tucked in the bottom of the bag. This is truly a quadruple-use bag, as it works equally well on & off the bike.

 

 

It has a spacious main compartment and side zippered pockets for small items. While it's small enough to flatten for easy storage.

 

A true hybrid for a bicycle bag, it does everything well.