The Gazelle S can support up to 23 different configurations of seat units, cots, car seats, Cocoon S soft cots and its detachable Shopping Basket. It can be used in the following modes: Single: For a single child, a cot, car seat or seat unit can be mounted onto the Gazelle S frame. A detachable Shopping Basket is also included on the frame to carry all of your day-to-day essentials. Sibling: To carry two children, the Shopping Basket can be replaced with another cot, seat unit or car seat to allow several different riding combinations. Twin: For twin babies, the Gazelle S can carry two cots, seat units or car seats. This allows the two children to travel with the same level of comfort.