The 2017 B-Agile Double is Britax’s best-selling, lightest and most easily maneuverable stroller for families with multiple children. The B-Agile Double won’t weigh you down thanks to its lightweight aluminum frame. And when you’re done walking for the day, the quick-fold design allows you to close the stroller in seconds. The B-Agile Double is such a customer favorite because it grants you the freedom to go practically anywhere. While large enough to carry two children, it easily fits through standard-sized doorways.