10 Best britax allegiance convertible car seat in Canada

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Last Updated - 2025/05/11

Best Choice

01
BRITAX

Britax One4Life All-in-One Car Seat, Onyx

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Main highlights

Washer & Dryer Friendly: No more hand washing or waiting for the cover to air-dry; Just quick and easy cleanup, so you can keep moving
No Added FR Chemicals: Naturally flame-retardant fabrics & foam with no added FR chemicals
Converts from a rear-facing infant seat (5- 50lb) to a forward-facing 5-point harness seat (22-65 lbs) to a high-back belt-positioning booster seat (40- 120lb)
ClickTight Installation: No stressing or struggling! Unobstructed seat belt paths clear the way for confident installation, and the automatic tensioner takes care of the tightening
10 years of use: One4Life convertible to booster car seat grows with your child from 5 – 120 lbs and up to 63” tall
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9.7

Exceptional

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02
BRITAX

Britax Poplar S Convertible Car Seat, 2-in-1 Design with ClickTight Technology, Stone Onyx

Free Shipping
Main highlights

Refined Comfort, Tailored Fit: This car seat features premium inserts and padding to create an elevated fit and feel
ReboundReduce Stability Bar: Carbon steel bar easily attaches to the car seat when installed rear-facing to minimize movement in the event of a crash; must be removed when installed forward-facing
Install with Confidence Every Time: With ClickTight technology, there’s no guessing or stressing. Fully open seat belt paths are clearly labeled and easy to access; open, thread and buckle and click it closed
Fit: Rear-facing 5-40 lbs / 2.3-18.1 kg; Forward-facing 22-65 lbs / 10-29.4 kg
2-in-1 Convertible Car Seat: The Poplar S fits up to 40 lbs/18.1 kg when installed rear-facing while easily switching to forward-facing as your child grows
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9.6

Exceptional

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03
BRITAX

Britax Poplar Convertible Car Seat, 2-in-1 Design with ClickTight® Technology, Glacier Graphite

Free Shipping
Main highlights

SpaceSaver Design: 17 inch/ 43.2 cm 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
Room to Grow: 14-position no-rethread harness and headrest adjust together easily to help create the perfect fit
ReboundReduce Stability Bar: Carbon steel bar easily attaches to the car seat when installed rear-facing to minimize movement in the event of a crash; must be removed when installed forward-facing
Install with Confidence, Every Time: With ClickTight technology, there’s no guessing or stressing. Fully open seat belt paths are clearly labeled and easy to access; open, thread and buckle, click it closed
2-in-1 Convertible Car Seat: The Poplar fits up to 40 lbs (18.1 kg) when installed rear-facing while easily switching to forward-facing as your child grows
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9.5

Excellent

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04
BRITAX

Britax Poplar Convertible Car Seat, 2-in-1 Design with ClickTight® Technology, Cobalt Onyx

Free Shipping
Main highlights

SpaceSaver Design: 17 inch/ 43.2 cm 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
Room to Grow: 14-position no-rethread harness and headrest adjust together easily to help create the perfect fit
ReboundReduce Stability Bar: Carbon steel bar easily attaches to the car seat when installed rear-facing to minimize movement in the event of a crash; must be removed when installed forward-facing
Install with Confidence, Every Time: With ClickTight technology, there’s no guessing or stressing. Fully open seat belt paths are clearly labeled and easy to access; open, thread and buckle, click it closed
2-in-1 Convertible Car Seat: The Poplar fits up to 40 lbs (18.1 kg) when installed rear-facing while easily switching to forward-facing as your child grows
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9.4

Excellent

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Value for Money

05
Graco

Graco 4Ever All-in-One Convertible Car Seat, 4-in-1 Baby to Big Kid Car Seat from 1.8-54 kg (4-120 lb), ProtectPlus Engineered, Raegen

18% Off Free Shipping

9.9 safety

9.7 lasts a long time

9.7 Easy installation
Main highlights

Washable seat cover is easy to remove without removing the harness
Steel-reinforced frame provides strength and durability
Simply Safe Adjust Harness System adjusts the height of your harness and headrest, in one motion, to ensure that your child is always properly secured
One-hand, 10-position head rest makes it easy to give your growing child a proper fit for optimal safety
Integrated harness storage compartment holds unused harness straps while in the belt positioning booster mode
InRight UAS attachment provides an easy, one-second attachment with an audio click cue to help ensure secure installation
Graco ProtectPlus Engineered: a combination of the most rigorous crash tests that helps to protect your child in frontal, side, rear, & rollover crashes. Engineered & crash tested to meet or exceed CA standard CMVSS 213, 213.1 and 213.2
Features an easy-to-read level indicator for hassle-free installation
6-position recline adjust to fit your growing child; it's comfy for them and convenient for you
4-in-1 car seat gives you 10 years of use: seamlessly transforms from rear-facing harness 1.8-18 kg (4-40 lb) to forward-facing harness 10-30 kg (22-65 lb) to highback booster 18-45 kg (40-100 lb) to backless booster 18-54 kg (40-120 lb)
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9.1

Excellent

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06
BRITAX

Britax Poplar Convertible Car Seat, 2-in-1 Design with ClickTight® Technology, Stone Onyx

Free Shipping
Main highlights

SpaceSaver Design: 17 inch/ 43.2 cm 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
Room to Grow: 14-position no-rethread harness and headrest adjust together easily to help create the perfect fit
ReboundReduce Stability Bar: Carbon steel bar easily attaches to the car seat when installed rear-facing to minimize movement in the event of a crash; must be removed when installed forward-facing
Install with Confidence, Every Time: With ClickTight technology, there’s no guessing or stressing. Fully open seat belt paths are clearly labeled and easy to access; open, thread and buckle, click it closed
2-in-1 Convertible Car Seat: The Poplar fits up to 40 lbs (18.1 kg) when installed rear-facing while easily switching to forward-facing as your child grows
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9.0

Excellent

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07
Graco

Graco Tranzitions 3-in-1 Harness Booster Seat, Toddler to Big Kid Car Seat from 10-45 kg (22-100lb), Harness/Highback/Backless Booster, Proof

30% Off Free Shipping

9.9 worth the money

9.9 Simple to use

9.5 Light weight
Main highlights

Seat pad, body support, and harness covers are comfortable and machine washable
Open-loop belt guides help properly position your vehicle’s seat belt
One-hand, 8-position adjustable headrest grows with your child
No-Rethread Simply Safe Adjust Harness System allows the headrest and harness to adjust together in one motion
Meets or exceeds the child restraint criteria for a frontal crash test under the CA CMVSS 213 and 213.2
Lightweight, portable seat is ideal for busy, active parents
Graco ProtectPlus Engineered: a combination of the most rigorous crash tests that helps to protect your little one in frontal, side, rear & rollover crashes
Graco ProtectPlus Engineered*: a combination of the most rigorous crash tests that helps to protect your little one in frontal, side, rear & rollover crashes (*Meets or exceeds the child restraint criteria for a frontal crash test under the CA CMVSS 213 and 213.2)
3-in-1 harness booster helps protect your child, from toddler to youth: Grows with your child from forward-facing harness 10-30 kg (22-65 lb) to highback booster 18-45 kg (40-100 lb) to backless booster 18-45 kg (40-100 lb)
2 easy-to-clean cup holders keep your child's drinks and snacks close at hand
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8.9

Very Good

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08
Diono

Diono Radian 3R, 3-in-1 Convertible Car Seat, Rear & Forward Facing, 10 Years 1 Car Seat, Slim Design Fits 3 Across, Jet Black

9.7 Support

9.3 Comfort

9.1 Easy installation
Main highlights

The original and only all-in-one convertible car seat that folds for travel or compact storage. FAA approved for airline use.
Rear-Facing for Longer - lovingly engineered to keep your child rear-facing up to 54 kg.
Mechanically engineered from reinforced automotive grade high-strength steel, our unique core shell shields and protects your child.
High-quality ComfortPlus Memory Foam, always included.
Fits 3-Across - our famous slim-fit design with zero compromises to safety, space, or comfort.
10 Years One Car Seat - from Birth to Booster (2.3 - 54 kg) it's all you will need. Grows with your child, ultimate protection on every road trip. 4 modes in 1 seat!
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8.6

Very Good

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09
Graco

Graco Extend2Fit Convertible Car Seat, 2-in-1 Forward & Rear-Facing Baby Car Seat, 1.8-30 kg (4-65 lb), Titus

Free Shipping
Main highlights

Steel reinforced frame provides strength and durability for years of use
Simply Safe Adjust Harness System adjusts the height of your harness and headrest in one motion to help ensure that your child is always properly secured
Seat pad is comfortable and machine-washable
One-second lower anchor attachment featuring our exclusive InRight UAS system
One-hand, 10-position adjustable headrest is easy to use and grows to properly fit your growing child
Fuss Free Harness Storage holds the buckle out of the way so it's easy to get baby in and out
Extend2Fit 4-position extension panel adjusts to provide 12.7 cm (5") additional leg room allowing your child to ride safely rear-facing longer
Designed to help protect your rear-facing infant from 1.8-22.5 kg (4-50 lb) and your forward facing toddler from 10-30 kg (22-65 lb)
6-position reclining seat helps keep your growing child comfy on your many journeys together
2 integrated cupholders keep your child's drinks or snacks close at hand
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8.3

Good

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10
BRITAX

Britax Grow With You ClickTight Harness-2-Booster, Cool N Dry

Free Shipping
Main highlights

Surrounded in Safety: 2 layers of side impact protection, steel frame, impact-absorbing base and forward movement reducing v-shaped tether
More Comfort: Stay-put, soft comfort pads keep your child's neck from rubbing against the harness strap
Install Confidently: With ClickTight, you know it's right in just 3 easy steps. Open, thread & buckle, close
Cool N Dry Fabric: improves air flow for a cooler ride; wicks away moisture to help keep your child dry
2-in-1 Booster Seat: Easily transitions from forward-facing harness mode to belt-positioning booster mode as your child grows from toddler to big kid
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8.2

Good

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