If you have some stuff to carry around while riding, say a laptop or briefcase, and not into messenger bags, TATO releases a commuter bike with a CSSB (known as Central storage system for bicycles) located at the bottom tubing.
CSSB system is developed by Tato in Switzerland, and as you can see was added into the frame. This allows you to ride with your laptop or briefcase out of the way. Available space is 400 x 320 x 95mm, and holds a volume of 12.16 liters.
The TATO Commuter Bike retails for a little over $1,500, with your choice of front suspension or rigid fork.