The Britax One4Life and Poplar S convertible car seats bundle keeps your child safe and comfortable in the car from birth through the booster seat years. The One4Life converts from a rear-facing infant seat to a forward-facing harness seat and finally a high-back booster, accommodating children 5-120 lbs and up to 63 inches. Its ClickTight installation system, steel frame, SafeCell technology and premium padding provide safety and comfort. Complementing it is the slim 17-inch Poplar S, which rear-faces to 50 lbs and switches to forward-facing. Its SpaceSaver design allows 3-across fit in most vehicles, while patented safety features and washable fabrics ensure durability. With stages that overlap, you can use both seats together as your family grows. The One4Life protects rear-facing infants and toddlers up to 50 lbs, then continues on as a forward-facing seat and booster. When your older child transitions to the One4Life as a booster, the Poplar S rear-faces the next baby up to 50 lbs. This bundle simplifies your family's travel needs, keeping children safe while allowing multiple kids to fit comfortably in your backseat.