Child Bike Trailers
Tow a toddler or two with one of these excellent trailers. Also ideal for lugging luggage too.
If you have more than one small child or you have just the one toddler but you want to take some stuff along with you all on a bike, a bike trailer is a grand tool for the job. They connect on the rear quick release of your bike via a hitch. You can quickly remove the trailer at any time (the hitch anchor stays discreetly on your bike). Most trailer fold down a bit for better storage and portability (holidays and so on). The more you spend the less weight and more features you will get.