The Bee is the most affordable, ASTM-certified bike trailer on the market ® is the most affordable, ASTM-certified bike trailer on the market. The Burley Bee Bicycle Trailer lets families bike on a budget without sacrificing safety and durability. It features mesh hammock-style seating for one or two children, wheel guards and a convenient rear tailgate for easy access to cargo. The bicycle tow arm (included) makes it easy for you to take your little ones along for your next family bike ride.