We would like a system that makes it easy to take the carrier to/from the car, but also something that folds easily on the metro. We will need the base for the car, the carrier, and the stroller (the whole shebang).

We do prefer those with three wheels and lighter weight is better.

“A travel system stroller is a stroller that is sold in a set with a matching infant car seat that is compatible for attaching to the stroller. The stroller can be used on its own, or with the matching infant car seat attached over the stroller seat. The stroller in a travel system stroller set is most often a full size stroller, but some sets come with a jogging stroller instead.”