We loved using this brilliant travel system with our twin baby girls. The basic chassis can be used as a single or double, with the babies facing either forwards or backwards towards you. We have the complete twin travel system to sell INCLUDING two carry cots, two seat fabrics and two Maxi-Cosi infant carseats. It is in very good condition and comes with rain covers and instructions. All the covers are removable and washable (and have been washed ready for sale!)