The original! Designed by the Burley Design Cooperative back in the day, widely imitated but never duplicated. The Burley Bee is your basic trailer transportation for two kiddos or lots of cargo. The bright yellow is visible on the road.
Trivia fact: the Burley Design Cooperative was founded by a group of people headed up by Alan Scholz, who went on to cofound Green Gear Cycles with his brother Hans. You may know them as the makers of Bike Friday.