Staying hydrated on the bike is easy with this BS-X39 water bottle bag from XLC for your child's bike trailer. It is essential you keep hydrated on your rides and also that you bring enough water for your bike trailer passengers, which is why XLC has made this handy water bottle bag specially designed for their child bike trailers. The BS-X39 is compatible with the XLC Mono, the XLC Mono², the XLC Duo and the XLC Duo² manufactured and sold in 2016. As the item is designed to work with these products, make sure you check your current trailer for compatibility before purchasing to avoid disappointment. This bottle bag is one of a large range of items from XLC designed for cycling.