The Child Carrying bicycle trailer is our first product. First produced in 1981 it was revised in 1990. However, in keeping with Equinox policy to avoid obsolescence all earlier products are compatible with any upgrades or innovations developed since. It now comes standard with a floor bag, 19" high folding sloped sides, and a standard length tongue. The sloped sides have an "opera" window sewn in and are designed to fold down for storage. The optional mesh screen and/or rain cover help protect your loved from the elements.