Let the vehicle plan lead this comparison. Britax Poplar S brings a 17 in published width, a ClickTight installation path and machine-wash-and-dry fabrics to width and laundry constraints. Nuna RAVA brings a lower published seat weight, a 5 lb rear-facing start and clearly documented belt-or-UAS routes to a different installation plan. Their similar child limits do not answer the main question: which exact seat can be installed correctly in the intended Canadian vehicle while preserving the space your family needs?
Build the vehicle-plan scorecard
Score the seats against the same five conditions: rear-bench width, front-passenger clearance, installation method, frequency of moving the seat, and cover-care instructions. Do this for every vehicle that matters. A seat that fits the primary car but cannot be used as planned in a caregiver's second vehicle is not the better whole-family choice.
| Vehicle-plan line | Nuna RAVA | Britax Poplar S |
|---|---|---|
| Current Canadian scope | CS05160 family | Current Canadian Poplar S |
| Rear-facing limits | 5-40 lb; up to 49 in | 5-40 lb; up to 49 in |
| Forward-facing limits | 25-65 lb; up to 49 in | 22-65 lb; up to 49 in |
| Published width | 19 in | 17 in |
| Published product dimensions | 19 in W x 27.25 in D x 27 in H | 17 in W x 20.5 in L x 23.5 in H |
| Published seat weight | 27.5 lb | 28 lb |
| Installation architecture | True Tension doors; use vehicle belt or UAS, never both | ClickTight; use the method allowed by the Canadian instructions |
| Recline | Six positions listed by Nuna Canada | Six positions listed by Britax Canada |
| Cover care | Machine wash cold, delicate; air dry | Britax lists machine-washable and dryer-friendly fabrics |
Exterior numbers are not installed clearance
Poplar S is published at 17 inches wide. That makes it the stronger paper candidate when the rear bench is shared with another restraint or passenger. Britax says it cannot guarantee a three-across fit in all vehicles. Treat 17 in as a reason to try it, not as a completed seating plan.
The published length figures need more care. Poplar S lists a 20.5 in product length, while Britax's Canadian FAQ says the seat is approximately 28.5 in front-to-back when reclined on a flat surface and may vary with vehicle seat angle and other factors. RAVA lists 27.25 in depth. These are not necessarily measured from identical installed reference points. A catalogue subtraction cannot decide front-passenger legroom.
Set the front seat for its usual occupant, then follow the exact seat and vehicle manuals to install each convertible at an allowed recline in the intended position. Record front-seat clearance and the remaining usable rear-bench space, and repeat in the second vehicle if the seat must move.
Choose the installation path you will repeat
For RAVA, choose one installation method permitted by the Canadian manual and move away from lower anchors when that manual's child-weight threshold is reached. Forward-facing use includes the top tether. The practical consequence is that the same seat can require a different installation routine as the child grows.
Poplar S uses Britax's ClickTight installation architecture, and its ReboundReduce stability bar attaches for rear-facing use. Britax's Canadian guidance says the anti-rebound bar is required rear-facing. The current Poplar S instructions, together with the vehicle manual, control the exact belt or lower-connector routing, recline, and forward-facing tether use.
A family may prefer ClickTight because its opening and closing sequence makes sense to the people who reinstall the seat. Another may prefer RAVA's True Tension doors and known transition from lower anchors to the vehicle belt. Those are usability preferences. The valid choice is the path every caregiver can execute according to both manuals.
Account for child stage, not only maximums
Both seats start rear-facing at 5 lb and end that mode at 40 lb, with a published height limit up to 49 in. Their forward-facing minimum weights differ: RAVA begins at 25 lb, while Poplar S begins at 22 lb. A minimum is not a recommendation to advance early.
Transport Canada advises not moving a child from rear-facing to forward-facing early. When forward-facing becomes appropriate, always use the top tether and do not move the child to the next stage early. Provincial or territorial rules may add age or other requirements.
Laundry is a specification, not a performance claim
RAVA's Canadian manual permits machine washing the seat cover and harness pads in cold water on a delicate cycle with mild detergent, followed by air drying. Other components have separate instructions, including spot cleaning the support wedge and wiping the buckle with a damp cloth.
Britax Canada lists Poplar S fabrics as machine washable and dryer friendly. That can win for a household whose routine depends on returning a cover to use without air-dry time. It does not prove one fabric releases stains faster, lasts longer, or is easier in actual use. Follow the exact care label and manual for the model and fabric received.
Two legitimate winning scenarios
Poplar S wins the narrow-bench and dryer scenario. Its 17 in published width is 2 in narrower than RAVA's, and Britax explicitly lists machine-wash-and-dry fabric care. If an in-vehicle check confirms the planned seating arrangement and every caregiver can use ClickTight correctly, those are defined advantages.
RAVA wins when its True Tension belt-or-UAS path is the route every regular installer can repeat. Use the in-vehicle review below to confirm that preference across the household's vehicles and documented child-weight transitions.
Neither seat should be called universally more compact from exterior dimensions, and neither should be ranked for protection from marketing language. Transport Canada states that compliance results are pass/fail and are not intended to rate seats against each other.
An untimed in-vehicle fit review
- Bring the child, vehicle manual, and current Canadian seat instructions.
- Install rear-facing at an allowed recline in the intended seating position.
- Set the front seat for its real occupant and check the whole rear bench.
- Rehearse the later forward-facing top-tether route without advancing the child early.
- Confirm the exact cover-care instructions and where the seat will dry or be reassembled.
Do the same planning exercise for forward-facing use. Locate the vehicle's tether anchor, consult the vehicle manual, and make sure the chosen forward-facing position remains usable. This is planning, not permission to advance modes before the child is ready.
Define the reinstall burden
If the seat moves weekly, note the full empty-seat weight, every required component, and the time available for a careful reinstall. RAVA and Poplar S differ by only 0.5 lb in published weight, so installation familiarity may matter more than carrying mass. Have every regular installer complete the chosen route using the current Canadian instructions.
If the seat will remain installed, prioritize the permitted method that preserves the vehicle positions the family uses. Record the installation method and the child-weight threshold that the current instructions say triggers a change; recheck only as those instructions direct.
Do not borrow a result from another car
Use the intended seating position in each regular vehicle for the comparison. A successful Poplar S or RAVA installation in one model does not approve the second. Complete the scorecard separately for each regular vehicle.
If a centre seating position is preferred, use the vehicle and restraint manuals to confirm the permitted position and installation method. Complete the same fit check there before choosing it.
See the current Nuna RAVA at baby enRoute and browse the Nuna collection. An exact-seat in-vehicle check, when product access permits, remains the deciding evidence for the vehicle plan.
Published width does not resolve front-to-back clearance or a shared rear bench. The compact-vehicle measurement guide supplies the neutral in-vehicle worksheet to run on both RAVA and Poplar S.
