Croozer 535 Double Child Bicycle Trailer (Green/Grey/Black) 3-in-1 double child carrier that converts to a bike trailer, stroller, or jogger Includes sturdy bicycle hitch arm with 2 axle-mounted hitches Detachable 8-inch front stroller wheel or 16-inch jogger wheel Low center of gravity keeps children safe; storage area behind seat Patented quick-fold system for storage; 100-pound capacity