Britax Poplar
The Britax Poplar rear-faces up to 50 lb, forward-faces up to 65 lb, and is 17 in wide, per Britax. A slim 17-inch Britax convertible with a ClickTight seat belt install and a no-rethread harness. It rear-faces up to 50 lb.
- $349.99List price
- 50 lbRear-facing to
- 65 lbHarness to
- 27.2 lbSeat weight
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Poplar: key facts
- The Britax Poplar rear-faces from 5 to 50 lb and 18 to 49 in tall; forward-faces with a harness from 30 to 65 lb and 35 to 49 in tall, per Britax.
- Outgrown by height: "Rear-facing: when the top of the child's head is at least 1" (2.5 cm) below the top of the head restraint. Forward-facing: when the top of the ears are below the top of the head restraint."
- It installs with seat belt (ClickTight).
- Britax says it expires 10 years after the date of manufacture.
- Britax lists it as certified for aircraft ("This Restraint is Certified For Use in Motor Vehicles and Aircraft.").
- It's 17 in wide at the widest point and weighs 27.2 lb.
From Britax's manual and published specs. Always follow the limits on your seat's labels.
How the Poplar stacks up
Against the 39 convertible car seats we track. The shaded band is where the middle half of them fall; the dot is this one.
Within the typical range for convertible car seats (9 years to 10 years).
Within the typical range for convertible car seats (40 lb to 50 lb).
The same as most convertible car seats (65 lb).
Within the typical range for convertible car seats (17 in to 18.9 in).
Within the typical range for convertible car seats (21.6 lb to 27.9 lb).
Within the typical range for convertible car seats ($129.99 to $499.99).
What sets the Poplar apart
Measured against the 39 convertible car seats we compare, from each maker's published specs.
- 5th narrowestof the 28 convertible car seats with it published: 17 in
- Weight: 27.2 lbin the middle half of the 25 convertible car seats that publish it (21.6 lb to 27.9 lb)
Next to its closest matches
- Peg Perego Primo Viaggio ConvertibleNext to it, the Poplar is 5 lb higher rear-facing limit; 5.6 lb heavier.
- Britax Poplar SNext to it, the Poplar is 0.8 lb lighter; $50 less; no anti-rebound bar (the Poplar S has it).
- Britax Galaxy360 SlimNext to it, the Poplar is $80 less; no anti-rebound bar (the Galaxy360 Slim has it); no rotates (the Galaxy360 Slim has it).
Flying with the Poplar
Britax's label: “This Restraint is Certified For Use in Motor Vehicles and Aircraft.” It is 17 in wide at its widest point.
What airlines say about car seats:
- American: “Each ticketed customer is allowed 1 stroller and 1 car seat to be checked free of charge” “If an unoccupied, adjoining seat is not available, the gate agent will check the safety seat to your final destination.” Source
- Alaska: “We will transport your child's car seat and stroller free of charge as checked baggage.” Source
- JetBlue: “Checking a child safety seat will not count towards your checked baggage allowance and there is no fee assessed” Source
- Spirit: “One (1) car seat will be accepted per child as checked baggage at no charge.” Source
- Frontier: “strollers and car seats can be checked for free.” Source
- Allegiant: “There is no charge for checking or gate checking one car seat per fare-paying passenger.” Source
- Breeze: “Child seats may be carried on board the aircraft if a seat has been purchased for the Infant or Child” Source
Quoted from each airline's page as of 2026-11-02.
Listed features
- Slim 17-inch width
- High 50 lb rear-facing limit
- 10-year life
Worth checking
- No anti-rebound bar listed (that is the Poplar S)
Where to buy the Poplar
Prices and availability change. We may earn a commission from some links.
- Check for recalls: Search the agency's recall list with the model number and date code from the label: NHTSA recall search.
- Car seat use and installation: see NHTSA's car seat page, which also lists free car seat inspection by certified technicians. Check the label and the maker's instructions, and ask your pediatrician about your child.
Full specs
| Britax Poplar | |
|---|---|
| Type | Convertible |
| List price | $349.99 |
| Rear-facing weight | 5–50 lb |
| Rear-facing height | 18–49 in |
| Forward-facing weight | 30–65 lb |
| Forward-facing height | 35–49 in |
| Seat weight | 27.2 lb |
| Width | 17 in |
| Head rule | Rear-facing: when the top of the child's head is at least 1" (2.5 cm) below the top of the head restraint. Forward-facing: when the top of the ears are below the top of the head restraint. |
| Newborn insert | Lower infant insert (optional): MAY be used for children who weigh 20 lbs (9.1 kg) or less rear-facing; not forward-facing. Positioning layer MUST be folded down for 5-40 lbs rear-facing. |
| Installation | seat belt (ClickTight) |
| Load leg | No |
| Anti-rebound bar | No |
| Rotates | No |
| Harness heights | 14 |
| Recline positions | 6 |
| Aircraft label | Certified for aircraft, per the maker |
| No added flame retardants | Yes |
| Expires after | 10 years |
Compare the Poplar with
How each closest rival differs from the Poplar, from the makers' specs.
- Peg PeregoPrimo Viaggio Convertiblerear-facing to 45 lbforward-facing to 65 lb$349.99
- 5 lb lower rear-facing limit
- 5.6 lb lighter
- BritaxPoplar Srear-facing to 50 lbforward-facing to 65 lb$399.99
- 0.8 lb heavier
- $50 more
- BritaxGalaxy360 Slimrear-facing to 50 lbforward-facing to 65 lb$429.99
- $80 more
- GracoEasyTurn 360rear-facing to 40 lbforward-facing to 65 lb$349.99
- 10 lb lower rear-facing limit
- 1.2 lb lighter
Poplar: questions answered
From Britax's published specs, last checked 2026-11-06.
Does the Britax Poplar rear-face longer than other convertible seats?
1 of the 50 convertible seats we track rear-face to a higher weight than its 50 lb. The highest is the Axkid One 3 at 65 lb. NHTSA: stay rear-facing "until he or she reaches the top height or weight limit allowed by your car seat's manufacturer." (NHTSA)
Will the Britax Poplar fit three across or in a small car?
It's narrower than 68% of the convertible seats we track, at 17 in. The narrowest is the WAYB Pico at 14.5 in. Fit depends on your vehicle; check each seat's manual and your vehicle manual. Car seat use and installation: see NHTSA's car seat page, which also lists free car seat inspection by certified technicians. Check the label and the maker's instructions, and ask your pediatrician about your child.
Can you bring the Britax Poplar on a plane?
Yes, Britax lists it as certified for aircraft; look for the red-lettered label that says so. The FAA asks that a car seat go in a window seat so it doesn't block the aisle, and the crew will look for that label. It weighs 27.2 lb to carry through the airport.
Poplar or Primo Viaggio Convertible: what's different?
By the makers' specs, the Poplar has no added flame retardants (maker's claim). See every spec side by side.
Is it OK to buy a used Poplar?
NHTSA publishes guidance on used car seats on its car seat page. Britax lists a lifespan of 10 years from manufacture for this model. Check the label and the maker's instructions, and ask your pediatrician about your child.
Still wondering? Write to us at hello@cribpicks.com and we'll look it up.
More convertible car seats
- JoieChili Spin SIrear-facing to 40 lbforward-facing to 65 lb$339.99
- EvenfloGold Revolve360 Slimrear-facing to 50 lbforward-facing to 65 lb$449.99
- GracoExtend2Fitrear-facing to 50 lbforward-facing to 65 lb$239.99
- ChiccoFit360 SE ClearTexrear-facing to 40 lbforward-facing to 65 lb$399.99
- NunaRAVArear-facing to 50 lbforward-facing to 65 lb$480
- Peg PeregoPrimo Viaggio Convertible Kineticrear-facing to 45 lbforward-facing to 65 lb$449.99
Where these specs come from
- us.britax.com/shop/car-seats/poplar-convertible-car-seat
- us.britax.com/press/archive/now-available-britax-poplar-poplar-s…
- us.britax.com/downloads/lerrmaftafhrwboxgnbnrjtxzawjrndacehm
Last checked 2026-11-06. Spot something wrong? Tell us. Read our editorial and safety policy and corrections.