Urban cargo system
Give your bike a boot
Extra storage and emergency spare wheel
Transformer: a holdall in disguise
Top of the class child transport
Huge two-child carrier that's excellent value
Bargain kid carrier with decent features
Good but fiddly child carrier
The Extrawheel is a single wheel trailer, à la the BOB Yak, albeit with one big difference.
Great value trailer for shopping and touring, but not quite expedition quality.