When we road as kids on gravel with ten speeds and bmx bikes, it was usually surrounded by corn fields.   Now that gravel is hip and cool, we made the Corn bag.  We debuted this at Ragbrai and it was a huge hit. 

Comes with detachable shoulder/ fannypack strap.  This gives you the option to detach the bag and carry your stuff when you go into store or hike a bike. 

Dimensions:   3.75 inches at it widest area and around 2.50 at its narrowest area.   Length is 9 iches.  Height is around 4 inches to 3 inches.