# Convertible car seats that also work as boosters Which convertible car seats can also be used as a booster seat for older children? Evenflo All4Stages Slim Plus Canopy 4\-in\-1 Convertible Car Seat: The seat has four modes with these weight ranges: rear\-facing 4\-40 lb, forward\-facing 30\-65 lb, high\-back booster 40\-100 lb and no\-back booster 40\-120 lb, giving up to 10 years of use\. Britax One4Life All\-in\-One Car Seat: One seat covers three stages and is sold as growing with the child for 10 years: rear\-facing infant and toddler use 5\-50 lb, forward\-facing harness use 30\-65 lb, and high\-back booster use 40\-120 lb\. Britax One4Life Slim All\-in\-One Car Seat: It converts from rear\-facing infant/toddler 5\-50 lbs to forward\-facing 30\-65 lbs to high\-back booster 40\-120 lbs\. Chicco OneFit LX ClearTex All\-in\-One Car Seat: Rear\-facing harness for 5\-40 lbs up to 43 in; forward\-facing harness for 26\.5\-65 lbs up to 54 in; booster for 40\-100 lbs up to 57 in\. Chicco OneFit LX ClearTex: The seat converts from rear\-facing harness \(5\-40 lbs\) to forward\-facing harness \(26\.5\-65 lbs\) to booster \(40\-100 lbs\)\. Joie Baby Saffron SI: The manual lists the highback booster weight range as 40 to 100 lb\. Graco SlimFit 3\-in\-1 Narrow All\-in\-One Convertible Car Seat \- Sydney: It is a 3\-in\-1 all\-in\-one convertible car seat that can be used rear\-facing, forward\-facing, and as a belt\-positioning booster\. ### 1. [Evenflo All4Stages Slim Plus Canopy 4\-in\-1 Convertible Car Seat](/products/ucp/evenflo-com/9190434668700) (sold by evenflo\.com) The seat has four modes with these weight ranges: rear\-facing 4\-40 lb, forward\-facing 30\-65 lb, high\-back booster 40\-100 lb and no\-back booster 40\-120 lb, giving up to 10 years of use\. - Booster range: The seat has four modes with these weight ranges: rear\-facing 4\-40 lb, forward\-facing 30\-65 lb, high\-back booster 40\-100 lb and no\-back booster 40\-120 lb, giving up to 10 years of use\. (listing) - Width: Assembled the seat measures 16\.9 in\. wide, 22 in\. deep and 24\.3 in\. high\. (guide) - Installation: The video reviewer found setup surprisingly straightforward, with the SecureTight system doing what it promises; it took a few minutes and the installed seat felt solid and secure\. (review) - Crash test: - ### 2. [Britax One4Life All\-in\-One Car Seat](/products/ucp/strolleria-com/8076366905418) (sold by strolleria\.com) One seat covers three stages and is sold as growing with the child for 10 years: rear\-facing infant and toddler use 5\-50 lb, forward\-facing harness use 30\-65 lb, and high\-back booster use 40\-120 lb\. - Booster range: One seat covers three stages and is sold as growing with the child for 10 years: rear\-facing infant and toddler use 5\-50 lb, forward\-facing harness use 30\-65 lb, and high\-back booster use 40\-120 lb\. (listing) - Width: The store's own page gives the seat's overall size as 18\.5 in long, 17\.5 in wide and 24\.5 in high\. (guide) - Installation: The reviewer found ClickTight installation genuinely easy in three steps with no need to kneel on the seat or fetch a second adult, and rear\-facing fit roomy for the baby while still narrow enough to seat two other car seats beside it on a standard SUV bench\. (review) - Crash test: - ### 3. [Britax One4Life Slim All\-in\-One Car Seat](/products/ucp/strolleria-com/8129392967754) (sold by strolleria\.com) It converts from rear\-facing infant/toddler 5\-50 lbs to forward\-facing 30\-65 lbs to high\-back booster 40\-120 lbs\. - Booster range: It converts from rear\-facing infant/toddler 5\-50 lbs to forward\-facing 30\-65 lbs to high\-back booster 40\-120 lbs\. (listing) - Width: Measured 18 inches at its widest point, about 1\.5 inches narrower than the standard One4Life's 19\.5 inches\. (review) - Installation: - - Crash test: - ### 4. [Chicco OneFit LX ClearTex All\-in\-One Car Seat](/products/ucp/strolleria-com/8064413990986) (sold by strolleria\.com) Rear\-facing harness for 5\-40 lbs up to 43 in; forward\-facing harness for 26\.5\-65 lbs up to 54 in; booster for 40\-100 lbs up to 57 in\. - Booster range: Rear\-facing harness for 5\-40 lbs up to 43 in; forward\-facing harness for 26\.5\-65 lbs up to 54 in; booster for 40\-100 lbs up to 57 in\. (guide) - Width: Assembled size is 21\.5 in long, 19 in wide and 27 in high\. (guide) - Installation: The reviewer had the seat secured in the vehicle within a few minutes using the LeverLock system, which removes guesswork about tension\. (review) - Crash test: In the lab's own sled testing the seat's head and chest sensor results were better than the group average, suggesting a margin of extra protection\. (review) ### 5. [Chicco OneFit LX ClearTex](/products/ucp/albeebaby-com/9564456714471) (sold by albeebaby\.com) The seat converts from rear\-facing harness \(5\-40 lbs\) to forward\-facing harness \(26\.5\-65 lbs\) to booster \(40\-100 lbs\)\. - Booster range: The seat converts from rear\-facing harness \(5\-40 lbs\) to forward\-facing harness \(26\.5\-65 lbs\) to booster \(40\-100 lbs\)\. (listing) - Width: - - Installation: LATCH was the easier install method but only slightly; the two\-point 'super cincher' strap has a learning curve, though once learned it produces a stable install, and there is no lock\-off for the LATCH strap\. (review) - Crash test: In the site's own sled crash tests the seat scored slightly better than the group average, with good head \(HIC\) and chest\-clip sensor results, suggesting a little extra margin of protection over an average seat\. (review) ### 6. [Joie Baby Saffron SI \(model C2401AA; SKUs begin C2401AA\)](/products/ucp/strolleria-com/7897047597130) (sold by strolleria\.com) The manual lists the highback booster weight range as 40 to 100 lb\. - Booster range: The manual lists the highback booster weight range as 40 to 100 lb\. (manual) - Width: Product dimensions are 22 in long, 19 in wide, and 24\.5 to 33 in high\. (guide) - Installation: The review scored the seat 71 out of 100 overall and described it as stylish and good for growing with a child, with good crash test results and good cup holders, but harder vehicle\-belt installation\. (review) - Crash test: In the review's commissioned crash tests, the seat earned an impressive crash test analysis result, with better\-than\-average head sensor results and one of the lowest chest clip sensor readings in the comparison group\. (review) ### 7. [Graco SlimFit 3\-in\-1 Narrow All\-in\-One Convertible Car Seat \- Sydney](/products/ucp/albeebaby-com/9564479750375) (sold by albeebaby\.com) It is a 3\-in\-1 all\-in\-one convertible car seat that can be used rear\-facing, forward\-facing, and as a belt\-positioning booster\. - Booster range: It is a 3\-in\-1 all\-in\-one convertible car seat that can be used rear\-facing, forward\-facing, and as a belt\-positioning booster\. (listing) - Width: The original SlimFit was introduced to solve back\-seat space problems and is described as narrow and affordable\. (blog) - Installation: - - Crash test: - Every value in the table is a fact RoboTrunk checked, linked to the page it came from\. A dash means no checked fact fills that cell\. Prices and stock change, so this page prints neither: each product name links to its RoboTrunk page, which shows them live\. Written 2026-10-18T03:14:35.012Z. This page is published by RoboTrunk, a store built for shopping agents. The store named on this page sells the product and ships it. RoboTrunk is not the seller and never holds the money. Buying works in one path. RoboTrunk's tools prepare a checkout at that store, then hand back a short-lived link. 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