Britax Poplar Convertible Car Seat - Magenta Onyx

Britax Poplar Convertible Car Seat

Ready to go—with room to grow.

The Britax Poplar™ Convertible Car Seat takes the guesswork out of moving up to the next stage. With its patented ClickTight® Installation and ultra-slim SpaceSaver™ design, it's made for easy, confident installs and a better fit in your back seat. This car seat supports extended rear-facing up to 50 lbs, giving your child the safest ride for longer, and seamlessly transitions to forward-facing as they grow.

Why Parents Love It
✅ ClickTight® Installation – Install in 3 simple steps: open, thread & buckle, then click it closed
✅ Slim Yet Spacious – Just 17" across to help fit 3-across* without sacrificing comfort
✅ Extended Rear-Facing – Accommodates children up to 50 lbs and 49” in height
✅ Naturally Flame-Retardant Fabrics – Free from added FR chemicals and safe to machine wash and dry
✅ Peace of Mind Built-In – SafeCell® crumple zone, carbon steel frame, and V-shaped tether help manage crash energy effectively

Smart Safety Meets Everyday Convenience

• 14-Position Quick-Adjust Headrest & Harness – Easily adapts to your growing child

• 6-Position Recline – Ensures the most comfortable and secure fit in your vehicle

• SafeCell® Technology – Built-in crumple zone helps absorb crash forces

• Patented V-Shaped Tether – Minimizes seat rotation and forward movement

• Reinforced Carbon Steel Frame – Adds strength and stability

• 5-Point Safety Harness – Evenly distributes crash energy across strong bones

• Dishwasher-Safe Cup Holders – Removable and easy to clean

• Slim Design – Designed for easier 3-across fit in many vehicles*

Specifications

• Product Dimensions: 20.5" L × 17" W × 23.5" H

• Seat Area Depth/Width: 11" / 12"

• Shoulder Width: 14"

• Harness Slot Heights: 8" to 17" (14 positions)

• Buckle Strap Depths: 4" – 7"

• Rear-Facing Use: 5–50 lbs, under 49"

• Forward-Facing Use: 22–65 lbs, under 49"

Britax Recommends

• Always keep children rear-facing as long as possible, up to the maximum height or weight limit

• Use the 5-point harness until your child outgrows it by height or weight

• Always secure the top tether when installing forward-facing

Note: Britax cannot guarantee 3-across fitment in all vehicles. Always check fit prior to purchase.

Free Shipping

We offer free shipping to all addresses within the contiguous US. Unfortunately, we can't ship to PO box addresses. Please feel free to request a shipping quote to PR, HI, AK, GU, APO, and FPO.

Shipping Policy

Most orders received before 12:01 am EST usually ship the same business day. Most baby products ship from our Baltimore, MD warehouse. 

Same Day Shipping Availability

*If your order is placed after 12:01 am EST and you would like us to ship your order that same business day, please email us at service@capitalkidz.com with your order number. We'll do our best to ship your order that day. 

Return Policy

We want you to be happy with your purchase! If you would like to return your item, simply email us at service@capitalkidz.com, and we'll provide you with return instructions. We gladly accept unused products — still in their original, undamaged packaging — for return or exchange within 30 days of delivery. 

Once your return request is approved, you may request to receive a discounted return shipping label from CapitalKidz. If you'd like us to schedule a FedEx pickup at your home, please let us know. We will email you a label and the cost of the discounted return shipping will be deducted from your refund. NO RESTOCKING FEES!

Your refund will issued to the original method of payment used for the purchase. We make every effort to process returns quickly, but occasionally it takes a bit longer. Please allow up to 14 business days from receipt of your return for your refund to be issued. 

All items are inspected upon receipt at our warehouse. A restocking fee may apply ONLY if an item is returned in used or damaged condition or without the original packaging. A refund may be denied if an item is used and/or damaged.

• Redemption of rewards points is final. When returning or exchanging an item, previously redeemed rewards points are not added back to your rewards account. 
• Refunds can only be issued to the same method of payment used for the original purchase.
• If the item being returned was a gift, we can (a) refund the original credit card, (b) exchange it for a different item, or (c) issue store credit. 
• If the item you purchased is defective, we will help you file a warranty claim with the manufacturer.

Rewards Points Program

Earn 5 points for every $1 you spend with us! To participate, simply create an account on our website and ensure you’re logged in when making purchases. Accumulate points with each transaction and redeem them for cash back on future orders.

Ways to Redeem:

• $20 off coupon: 2,000 Points
• $40 off coupon: 4,000 Points
• $70 off coupon: 7,000 Points

It’s our way of saying thank you for shopping with us!

If you earn rewards points from a purchase, please note that these points cannot be used for another purchase if you plan to return the original item that earned those points. To ensure fairness in our rewards program, we may need to cancel your order, forfeit the rewards points, and potentially exclude you from the rewards points program if this policy is not followed. We appreciate your understanding and cooperation.

International Shipping

We offer international shipping for select items to almost every country worldwide. Please email us at service@capitalkidz.com to request shipping options, cost, and eligibility. 

We Are Here for You

At CapitalKidz, our customers truly come first. We are dedicated to providing you with the knowledge and guidance to make informed decisions about your baby gear needs, while offering you the lowest price.

Please feel free reach out with any questions at service@capitalkidz.com. Happy shopping!