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Britax
us.britax.com › home › shop baby gear › car seats › one4life® slim clicktight® all-in-one – car seat & booster combo
One4Life Slim ClickTight All-in-One – Car Seat & Booster Combo
August 25, 2020 - The One4Life® Slim all-in-one car seat takes your child from birth to big kid with trusted Britax safety, ClickTight® installation, and a slim SpaceSaver™ design. As a convertible and harness-2-booster seat in one, it grows with your child ...
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Britax
us.britax.com › home › shop baby gear › car seats › poplar® convertible car seat - slim 17" design
Britax | Poplar Convertible Car Seat – Slim 17” Design
September 4, 2025 - Slim outside and spacious inside, this convertible car seat features 17-inch SpaceSaver technology designed to fit 3-across* without compromising on trusted Britax safety and premium comfort.
Discussions

End my decision paralysis: Britax Poplar vs. One4Life vs. BabyJogger City car seat.
Coming from a mom of three that’s bought literally every car seat out there… Any other passengers in back? What kind of car? Without that info I vote Britax poplar. We had the britax boulevard clicktight which is essentially the poplar but an “old version”. It was one of my favorite seats ever. My kids liked it and they were in it until about 4 when I transitioned them to a combination seat and passed it down to my younger one. It’s slim front to back and side to side. Has an optional anti rebound bar, is super simple to install, and easy to adjust. The one4life is bulky and you’ll need another car seat anyway. Boosters are cheap and a dedicated booster will be way less bulky that a 3 in 1 or an “all in one”. The baby jogger city turn car seat is also super bulky and can only turn while rear facing. The turning is a convenience and if you have a smaller vehicle that’s probably what I’d get just for convenience. But if you have a lot of headspace or an SUV you can get away with a non turning seat. I have a Tahoe and bought a revv for baby and keep forgetting to turn it. I feel so silly for buying it because it’s super expensive and I have so much headspace that I can lift baby in and out without issue. Csftl reviews on all three choices: https://csftl.org/baby-jogger-city-turn-convertible-car-seat-review/ https://csftl.org/britax-poplar-convertible-car-seat-review/ https://csftl.org/britax-one4life-review-united-states-and-canada/ More on reddit.com
🌐 r/Buyingforbaby
20
4
December 23, 2024
Can a Britax One4Life Slim fit in the middle seat?
You need to measure the width of the vehicle seat and the width of the One4Life Slim base, Britax doesn’t allow side overhang. If the base fits, it will fit. I expected to hate the Poplar harness pads and I don’t. They’re fine. More on reddit.com
🌐 r/CPST
1
1
August 16, 2024
Britax Poplar car seat review
Please check out NZ Car seat discussion group on Facebook. You’ll probably have more responses there . We have a boulevard and a one-4-life (weight limit 54kg) as our main seats. The idea is the younger child uses the one4life until the older grows out of the boulevard, and then they swap. Then once the younger child grows out of the boulevard, they get the one-4-life again and hopefully by that time, the older child won’t need a harnessed seat/can just sit in the car normally. More on reddit.com
🌐 r/auckland
15
0
January 11, 2024
Stuck between Britax Poplar or Graco Slim3fit LX
Graco makes three seats with similar names. SlimFit3 and True3Fit are the same seat. SlimFit is an older seat that is not narrow in width. Are you shopping for narrow seats to fit 3 in the backseat? Or looking for compact front to back? More on reddit.com
🌐 r/CPST
13
0
April 14, 2024
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Target
target.com › s › britax+slim+car+seat
"britax slim car seat" : Target
Shop Target for britax slim car seat you will love at great low prices. Choose from Same Day Delivery, Drive Up or Order Pickup plus free shipping on orders $35+.
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Reddit
reddit.com › r/buyingforbaby › end my decision paralysis: britax poplar vs. one4life vs. babyjogger city car seat.
r/Buyingforbaby on Reddit: End my decision paralysis: Britax Poplar vs. One4Life vs. BabyJogger City car seat.
December 23, 2024 -

We are out of infant stage and are debating the pros and cons of the multitude of options now available on the market. If you have either of these- do you love them, have regrets, or other comments? Please help me decide!

Top answer
1 of 5
4
Coming from a mom of three that’s bought literally every car seat out there… Any other passengers in back? What kind of car? Without that info I vote Britax poplar. We had the britax boulevard clicktight which is essentially the poplar but an “old version”. It was one of my favorite seats ever. My kids liked it and they were in it until about 4 when I transitioned them to a combination seat and passed it down to my younger one. It’s slim front to back and side to side. Has an optional anti rebound bar, is super simple to install, and easy to adjust. The one4life is bulky and you’ll need another car seat anyway. Boosters are cheap and a dedicated booster will be way less bulky that a 3 in 1 or an “all in one”. The baby jogger city turn car seat is also super bulky and can only turn while rear facing. The turning is a convenience and if you have a smaller vehicle that’s probably what I’d get just for convenience. But if you have a lot of headspace or an SUV you can get away with a non turning seat. I have a Tahoe and bought a revv for baby and keep forgetting to turn it. I feel so silly for buying it because it’s super expensive and I have so much headspace that I can lift baby in and out without issue. Csftl reviews on all three choices: https://csftl.org/baby-jogger-city-turn-convertible-car-seat-review/ https://csftl.org/britax-poplar-convertible-car-seat-review/ https://csftl.org/britax-one4life-review-united-states-and-canada/
2 of 5
2
We cross referenced reviews with Consumer Reports. We went with the Britax Poplar. We also have the Boulevard, the previous model.
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Britax
us.britax.com › home › shop baby gear › car seats › poplar® s convertible car seat - slim 17" design
Britax | Poplar S Convertible Car Seat – Slim 17” Design
September 8, 2025 - Slim outside, spacious inside: 17” seat helps you save backseat space without compromising on trusted Britax safety and premium comfort. Install with confidence in three easy steps: open, thread & buckle, click it closed.
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Baby's 1st
babys1st.com › products › britax-one4life-slim-all-in-one-car-seat
Britax One4Life Slim All-in-One Car Seat – Baby & Kids 1st
Britax One4Life Slim All-in-One Car Seat
The One4Life® Slim all-in-one car seat takes your child from birth to big kid with trusted Britax safety, ClickTight® installation, and a slim SpaceSaver™ design. As a convertible and harness-2-booster seat in one, it grows with your child for 10 years. It starts rear-facing with an extended capacity of up to 50 lbs., so your child can ride rear-facing longer. It easily converts to forward-facing toddler mode (up to 65 lbs.) and high-back belt-positioning booster mode (up to 120 lbs.) when your child is ready. With a slim outside and spacious inside, the 17.5” seat is designed to fit 3 across*
Price   $449.99
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Britax
us.britax.com › home › choosing a car seat
Britax | Choosing a Car Seat
April 28, 2021 - Ready to go with room to grow! The Poplar® convertible car seat takes the stress out of moving to the next car seat stage with trusted Britax safety, ClickTight® installation, and a slim SpaceSaver™ design.
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Amazon
amazon.com › Britax-SpaceSaver-Rear-Facing-Forward-Facing-Installation › dp › B0DPLJZTH2
Amazon.com: Britax One4Life Slim All-in-One Car Seat, 10 Years of Use, 17.5” SpaceSaver Design, Converts from Rear-Facing Infant Car Seat to Forward-Facing Booster Seat, ClickTight Installation, Raven Black : Everything Else
SpaceSaver(TM) Design: Slim outside, spacious inside! The 17.5” seat is designed to fit 3 across without compromising on trusted Britax safety and premium comfort *Britax cannot guarantee 3-across installation fitment in all vehicles · Premium Car Seat Cover: Features a soft knit fabric with woven mélange accents that are made from recycled polyester; the cover is safe to machine-wash and dry and naturally flame retardant with no added FR chemicals
Find elsewhere
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Baby Grand
babyongrand.com › products › britax-one4life-slim-all-in-one-car-seat
Britax One4Life Slim All-in-One Car Seat – Baby Grand
Britax One4Life Slim All-in-One Car Seat
The One4Life® Slim all-in-one car seat takes your child from birth to big kid with trusted Britax safety, ClickTight® installation, and a slim SpaceSaver™ design. As a convertible and harness-2-booster seat in one, it grows with your child for 10 years. It starts rear-facing with an extended capacity of up to 50 lbs., so your child can ride rear-facing longer. It easily converts to forward-facing toddler mode (up to 65 lbs.) and high-back belt-positioning booster mode (up to 120 lbs.) when your child is ready. With a slim outside and spacious inside, the 17.5” seat is designed to fit 3 across*
Price   $449.99
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The Car Seat Pros
thecarseatpros.com › blog › one4lifeslimreview
2025 Britax One4Life Slim ClickTight Review — The Car Seat Pros
May 18, 2025 - The Britax One4Life Slim ClickTight All-in-One car seat has a mile-long list of features: a robust ClickTight belt-tensioning lockoff panel, a top harness slot height higher than most harness-to-booster seats, a top shoulder belt guide higher ...
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BabyGearLab
babygearlab.com › vehicle safety › car seat reviews
Best Convertible Car Seats | Crash Tested
Graco 4Ever DLX
Seats coming in close behind top-performers include the Baby Jogger City Turn, Nuna RAVA, Graco 4Ever DLX, Graco SlimFit 3-in-1, Graco Extend2Fit 3 in 1, and the Britax Poplar S. The hardest to install using LATCH are the Safety 1st Grow and Go All-in-One, Diono Radian 3RXT Safe+, Clek Fllo, and the Maxi-Cosi Pria All-in-One. ... The safest spot to install your car ... Car seat safety can create anxiety in any parent. Whether your fears are crash test performance or perfecting your installation, finding the right seat for...
Rating: 4.8 ​
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YouTube
youtube.com › playlist
Britax® One4Life® Slim All-in-One Car Seat – 10 Years of Safety in a Slim Fit - YouTube
Meet the Britax One4Life® Slim All-in-One Car Seat — your child’s safe, comfortable ride from birth to big kid, now in a space-saving design! With trusted Cl...
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Bambi Baby
bambibaby.com › home › britax › britax one4life slim all-in-one car seat
Britax One4Life Slim All-in-One Car Seat – Bambi Baby
The Britax One4Life® Slim All-in-One Car Seat is designed to grow with your child from birth to big kid, providing 10 years of trusted safety and comfort. It transitions seamlessly from rear-facing (up to 50 lbs.) to forward-facing (up to 65 ...
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Clek Fllo
csftl.org › britax one4life slim multimode car seat review
Britax One4Life Slim Multimode Car Seat Review - Car Seats For The Littles
May 15, 2025 - We’re thrilled to see that our friends at Britax are introducing narrower versions of seats we already know and love. The latest seat to join this growing group is the One4Life Slim multimode seat.
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Britax
us.britax.com › home › shop baby gear › car seats
Britax | Car Seats
February 28, 2025 - Use our fit finder tool and comparison chart to narrow down your car seat choices.
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Kidsland
kidslandusa.com › home › britax one4life slim
Britax One4life Slim – Kidsland
Britax One4life Slim
Britax One4Life Slim all-in-one car seat Keep your child safe on the road from a little one to a big kid in the same car seat! The Britax One4Life Slim all-in-one car seat, designed to grow with your child for 10 years of safe and comfortable travel. With its innovative ClickTight installation, this car seat makes it easy to securely install in just three steps. The slim design fits seamlessly in your vehicle, providing top-tier safety and comfort without compromising space. Transforming from a rear-facing seat to forward-facing and then to a booster, the Britax One4Life Slim ensures your chi
Price   $449.99
Price   $$
Address   3700 Wilshire Blvd Ste 125, 90010, Los Angeles
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Berg's Baby & Teen
bergsbaby.com › products › britax-one4life-slim-all-in-one-car-seat
Britax One4Life Slim All-in-One Car Seat – Berg's Baby & Teen Furniture
Britax One4Life Slim All-in-One Car Seat
The One4Life® Slim all-in-one car seat takes your child from birth to big kid with trusted Britax safety, ClickTight® installation, and a slim SpaceSaver™ design. As a convertible and harness-2-booster seat in one, it grows with your child for 10 years. It starts rear-facing with an extended capacity of up to 50 lbs., so your child can ride rear-facing longer. It easily converts to forward-facing toddler mode (up to 65 lbs.) and high-back belt-positioning booster mode (up to 120 lbs.) when your child is ready. With a slim outside and spacious inside, the 17.5” seat is designed to fit 3 across*
Price   $449.99
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britax
britax.ca › one4life-slim-all-in-one-car-seat
One4Life Slim All-In-One Car Seat — britax
This slim car seat is easy to clean, and the cover is safe to machine wash and dry with no added FR chemicals. ... Slim outside, spacious inside! 44.5 cm (17.5”) seat helps you save backseat space without compromising on trusted Britax safety ...
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Albee Baby
albeebaby.com › products › britax-one4life-slim-clicktight-all-in-one-convertible-car-seat-mineral-gray
Britax One4Life Slim ClickTight All-in-One Convertible Car Seat - Mine – Albee Baby
Britax One4Life Slim ClickTight All-in-One Convertible Car Seat - Mineral Gray
Britax One4Life All-in-One Car Seat grows with your child and converts to a booster, accommodating your growing child until 10 years old. With its slim design, you can easily fit 3 across in most vehicles without compromising safety and comfort. Features Convertible to booster car seat grows with your child from 5 – 120 lbs and up to 63” tall. Sleek 17.5" wide design to fit 3 across in most vehicles. 2 Layers of Side Impact Protection, an energy-absorbing shell, and foam lining surround the head, neck & torso. Exclusive SafeCell Technology acts as a crumple zone, absorbing crash energy to hel
Price   $449.99
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Reddit
reddit.com › r/cpst › can a britax one4life slim fit in the middle seat?
r/CPST on Reddit: Can a Britax One4Life Slim fit in the middle seat?
August 16, 2024 -

Can a Britax One4Life Slim fit in the middle seat of the second row bench in wide mode of a 2024 Honda Odyssey? Looking to move my 11m old to a convertible. She sits side by side with my almost 4yr old (38 lbs, 40 inches) RF in a Nuna Rava. I prefer a FR free seat and keeping the kids right next to each other to allow for an adult in 2P. I don't like that the Poplar has non-removeable harness pads and prefer a FR free seat so the Slim3LX is out if I stick w that. Also considering a Myfit for the oldest and giving the Rava to the baby if that would fit better.