This car seat bundle pairs the Britax One4Life all-in-one convertible car seat with the Britax Poplar S slim convertible car seat to cover your child's needs 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 tall. Its click-tight installation system, no-rethread harness with 15 positions, and 9 recline angles make adjusting the seat easy as your child grows. Safety features include a steel frame, SafeCell crumple zone, and V-shaped tether. Complementing the One4Life, the Poplar S slim design allows 3-across fit in most vehicles to accommodate multiple kids. It rear-faces to 50 lbs then transitions to a forward-facing seat. The Poplar S shares convenient click-tight installation and a no-rethread 14-position harness with the One4Life. Both seats have machine-washable covers and dishwasher-safe cup holders. With over 10 years of use, premium comfort features, and the latest safety innovations from Britax, this convertible seat bundle provides a complete solution for safely transporting kids from infancy through the grade school years.