You will be able to mix and match your Baby Jogger City Select into 16 different combinations using the additional City Select products (sold separately). Great for twins or a Toddler and Infant. Mix and match between the 2 Bassinettes, 2 capsules, 2 seats, 1 Bassinette & 1 Seat, Facing you, facing each other or away and many more. The  different combination will suit any parents/careers needs..