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CERTAIN CONTENT THAT APPEARS ON THIS SITE COMES FROM AMAZON. THIS CONTENT IS PROVIDED ‘AS IS’ AND IS SUBJECT TO CHANGE OR REMOVAL AT ANY TIME.
Price on Amazon.com as of 2026-11-02 17:37 UTC, and subject to change.
A convertible car seat with 2 modes: rear-facing harness 5 to 50 lb, 18 to 49 in; forward-facing harness 30 to 65 lb, 35 to 49 in.
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CERTAIN CONTENT THAT APPEARS ON THIS SITE COMES FROM AMAZON. THIS CONTENT IS PROVIDED ‘AS IS’ AND IS SUBJECT TO CHANGE OR REMOVAL AT ANY TIME.
The Britax Poplar S is a slim convertible car seat with a ReboundReduce stability bar for rear-facing use. The manual allows rear-facing from 5 to 50 lb and 18 to 49 inches, and forward-facing from 30 to 65 lb and 35 to 49 inches. It is certified for aircraft and expires after 10 years.
The Poplar S suits a family that wants the narrow Poplar shell plus an anti-rebound bar while the child rides rear-facing. The bar must come off for forward-facing, and Britax lists the seat at 28.0 lb. Against the Poplar, Britax lists the same limits, 14 harness positions and 17 inch width, a 27.2 lb seat weight and a single infant insert, with no stability bar among its features.
A research summary of Britax’s published specifications and manual, read . Not a hands-on test or a crash-safety rating.
This seat covers 2 stages, and a child has to meet every limit of the stage they are in. Britax gives it a 10-year life from the date of manufacture, so check the date label before using a hand-me-down.
| Mode | Child weight | Child height | Minimum age | Conditions |
|---|---|---|---|---|
| Rear-facing harness | 5 to 50 lb | 18 to 49 in | Not published | Lower anchor installation limited to 35 lb (manual) |
| Forward-facing harness | 30 to 65 lb | 35 to 49 in | Not published | Lower anchor installation limited to 35 lb (manual) |
A child must meet every limit for the mode they use. The labels on your seat and its manual are the final word.
Every install is a fit between one seat and one vehicle. Read both manuals, and use a free inspection station if anything is unclear.
At 17 in at its widest, this seat is one of the narrower ones in its class and is a candidate for three across in many mid-size cars. It weighs 28 lb, which matters if you will move it between cars or carry it through an airport.
Cowmooflage, Stone Onyx, Glacier Graphite, Onyx, Sand Onyx, Ruby Onyx, Arctic Onyx.
The manual says the stability bar may be used for rear-facing installs and must be removed for forward-facing. You attach it before installing: open the ClickTight by lifting the front cover flap and squeezing the release buttons, insert the bar into the two openings at the front of the seat, check that its release buttons are fully engaged, and pull on both sides to confirm. To remove it, you press the release button and pull it away one side at a time. The manual warns not to use the bar to carry the seat. It is sponge cleaned with warm water and mild soap, never machine washed.
Recline comes first. Rear-facing, the indicator ball must be completely in the blue section, the car must be on level ground, and Britax recommends the most reclined position for a baby without head and neck control. The base must be flat and parallel on the vehicle seat, with no more than 3 inches over the front edge. With the lap-shoulder belt, the preferred method, both parts of the belt go through the rear-facing belt paths and closing the ClickTight takes the place of locking the retractor. A lap belt must be locked. The tether is not used rear-facing and stays on its storage hook.
The Poplar S manual lists an upper body support pillow and a lower infant insert. Both may be used from 5 to 20 lb rear-facing; no insert is used above 20 lb rear-facing or at all forward-facing. The lower insert sits on top of the positioning layer. That layer must be folded down from 5 to 40 lb rear-facing and from 30 to 40 lb forward-facing, and may be up or down above 40 lb. When folded up, it goes behind the head restraint bib.
Before turning it around, you remove the stability bar and the infant inserts. The recline ball must sit within the dashed green lines, the harness goes in the closest position above the shoulders, and the tops of the ears must be below the top of the head restraint. Britax strongly recommends the tether forward-facing. Its colored stitching works as a crash indicator: if any of it has ripped, the seat must be replaced. The lower anchors still stop at 35 lb, so a heavier child is installed with the vehicle belt.
No campaign in the current NHTSA child-restraint data names this model family, and I have not run a separate review for it. Check your seat’s model number and date of manufacture before use.
The manual allows rear-facing from 5 to 50 lb and 18 to 49 inches, and forward-facing from 30 to 65 lb and 35 to 49 inches. Head and ear clearance to the top of the head restraint also apply.
Britax Poplar S user guide P15154600 (PDF) (opens in a new tab)
No. The manual says the stability bar must be removed for forward-facing installs and may be used only rear-facing.
Britax Poplar S user guide P15154600 (PDF) (opens in a new tab)
Yes. The manual says it is certified for motor vehicles and aircraft, with the aircraft lap belt routed through the rear-facing or forward-facing belt paths. It also says the seat may not fit all aircraft.
Britax Poplar S user guide P15154600 (PDF) (opens in a new tab)
Britax lists it at 28.0 lb, with dimensions of 20.5 x 17 x 23.5 inches and a slim 17 inch design. It says 3-across fit cannot be guaranteed in all vehicles.
Britax Poplar S Convertible Car Seat product page (opens in a new tab)
Britax lists the Poplar with the same 50 lb rear-facing and 65 lb forward-facing limits and a 14-position harness, at 27.2 lb, with one infant insert and no stability bar among its listed features.
Britax Poplar Convertible Car Seat product page (opens in a new tab)
Answers refer to the model and manual version on this page. Check the instructions supplied with your seat.
| Model | Top child weight | Seat weight | Width | Usable life |
|---|---|---|---|---|
| Poplar S Convertible Car Seat (this seat) | 65 lb | 28 lb | 17 in | 10 years |
| Poplar Convertible Car Seat | 65 lb | 27.2 lb | 17 in | 10 years |
| One4Life ClickTight All-in-One Car Seat | 120 lb | 30 lb | 19.5 in | 10 years |
| One4Life Slim All-in-One Car Seat | 120 lb | 28 lb | — | 10 years |
Other convertible seats whose published weight and height limits overlap the Poplar S Convertible Car Seat.
| Mode | Weight | Height |
|---|---|---|
| Rear-facing harness | 5–50 lb | 18–49 in |
| Forward-facing harness | 30–65 lb | 35–49 in |
6% off$329.99List price $349.99Glacier Graphite 2.0 · Amazon price as of 2026-11-02 17:37 UTC, subject to change
| Mode | Weight | Height |
|---|---|---|
| Rear-facing harness | 5–50 lb | 18–49 in |
| Forward-facing harness | 30–65 lb | 35–49 in |
$429.99Pebble · Amazon price as of 2026-11-02 17:37 UTC, subject to change
| Mode | Weight | Height |
|---|---|---|
| Rear-facing harness | 4–40 lb | Up to 43 in |
| Forward-facing harnessfrom 12 months | 26.5–65 lb | Up to 49 in |
$439.99Oat · Amazon price as of 2026-11-02 19:41 UTC, subject to change
| Mode | Weight | Height |
|---|---|---|
| Rear-facing harness | 5–40 lb | 19–40 in |
| Forward-facing harness | 30–65 lb | 34.4–49 in |
$89.98Price on coscokids.com as of 2026-10-07 05:43 UTC, subject to change
