The Dutch know a thing or two about hauling stuff on a bike, and Fietsklik has introduced a line of bicycle carrying solutions. This system utilizes a “Klik” adapter, which allows a standard pannier rack to accept a range of special accessories – that the company makes of course!
This includes sturdy box-racks, bags and even a child seat.
Fietsklik Official Website
[Via BikeRadar: Fietsklik lockable luggage solutions]