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The Graco Junior Maxi i-Size R129 Highback Booster is a lightweight, safety-certified car seat designed for children aged approximately 3.5 to 12 years (100-150 cm). Featuring a 10-position adjustable headrest, retractable cupholders, and a machine-washable cushioned seat pad, it combines comfort, convenience, and compliance with the latest R129 safety regulations. Its durable yet portable design makes it a top choice for modern families seeking reliable protection and effortless usability.








| ASIN | B0BMGNDJHV |
| Age Range Description | Kid |
| Best Sellers Rank | 154 in Baby Products ( See Top 100 in Baby Products ) 1 in Car Seats (Baby Products) |
| Brand | Graco |
| Brand Name | Graco |
| Colour | Midnight |
| Country Of Origin | China |
| Customer Reviews | 4.7 out of 5 stars 3,135 Reviews |
| Forward Facing Car Seat Minimum Height | 60.5 Centimetres |
| Forward Facing Maximum Weight | 36 Kilograms |
| Harness Type | 3-Point |
| Included Components | Car seat, instruction manual |
| Infant Toddler Car Seat Type | Booster Car Seat |
| Installation Type | Seat Belt |
| Installation type | Seat Belt |
| Item Dimensions D x W x H | 53.7D x 40.8W x 81.7H centimetres |
| Item Type Name | car seat; big kid car seat; toddler car seat; forward facing car seat; R129; i-size |
| Item Weight | 3.49 Kilograms |
| Manufacturer | Graco |
| Manufacturer Part Number | 8CT899MDNEU |
| Manufacturer Warranty Description | 2 year manufacturer |
| Material | Alloy Steel, Polyester, Polypropylene |
| Material Type | Alloy Steel, Polyester, Polypropylene |
| Maximum Height Recommendation | 150 Centimetres |
| Maximum Weight Recommendation | 36 Kilograms |
| Minimum Height Recommendation | 100 Centimeters |
| Minimum Weight Recommendation | 15 Kilograms |
| Model Number | 8CT899MDNEU |
| Number of Height Positions | 10 |
| Orientation | Forward Facing |
| Product dimensions | 53.7D x 40.8W x 81.7H centimetres |
| Unit Count | 1 Case |
C**A
Very good seat and great value
Great car seat. Lightweight but sturdy and my granddaughter declares it to be very comfortable. Handy pull out cup holder on each side. It was very easy to adjust the headrest to the right height.
A**�
Perfect car seat
Excellent quality. My 6 year old granddaughter loves it and doesn’t take up much space in the car. Extremely simple to fit. Has 2 cup holders and I purchased a separate cushion for the seat belt incase she falls asleep. Very sturdy so yeah would definitely recommend x
J**O
Good price and well made...
Best value car seat....Highly reccomend..... Needed to upgrade from baby seat.. My grandson loves the cup holders...real bonus....would deffinately buy again...
J**H
Economic Child car seat
The product is good but the seating cushion is so thin, feel confused about the comfortability for kids during long drive. It is easy to instal and handle.
R**N
Fantastic seat for 15kg and over
Been using this for a while now and it's lovely for the price. It'not too bulky like some are, the back comes off when it's time to move to just the booster seat, and it has 2 cup holders that can be pushed in when not in use. The booster sits nicely in the back seat, and just about fits in the back with 2 other booster seats, as long as they're not too bulky. Seat belt fits into a clip on the back to help keep the cross body part secure without sitting on the child's neck. Note: This is not a seat with a 3 point harness. It is the next step up from those seats. We use weight to move up to the next stage, it is my understanding that the weight to move up is from a 3 point harness fully secured base, to one like this is 15kg.
L**D
Sturdy and safe.
Very sturdy and safe seating for my grandson. Easily put together, will be put to good use very often.
V**L
Leight weight
Nice and light to move from pillar to post
J**A
Sleek Design and Long Lasting
Finding the right car seat can feel overwhelming, especially when you want something that’s safe, comfortable, practical, and built to last. The Graco Junior Maxi i-Size R129 Highback Booster ticks every box and honestly makes everyday family life that little bit easier. From the moment you take it out of the box, you can tell it’s been designed with real parents in mind. It’s lightweight enough to move between cars without struggling, yet still feels sturdy and secure once installed. The i-Size R129 safety standard gives extra peace of mind, knowing your child is travelling with enhanced side-impact protection and modern safety features that meet the latest regulations. What really stands out is how comfortable it is for children. The padded seat and supportive highback design make longer journeys far less stressful. Whether it’s the school run, weekend trips to grandparents, or long motorway drives during holidays, kids seem genuinely happy sitting in it — and that alone is a huge win for parents. One of the unexpected favourites has to be the cupholders. It sounds simple, but having a dedicated spot for drinks and snacks helps keep the car cleaner and keeps everything within easy reach for little passengers. It’s one of those thoughtful touches you quickly realise you can’t live without. Another big advantage is the longevity. Suitable from 100–150cm (approximately 3.5 to 12 years), this is a seat that grows with your child. The adjustable headrest makes it easy to adapt as they get taller, meaning you won’t need to replace it every few years. That makes it excellent value for money as well. The sleek design also deserves a mention. Unlike bulky car seats that dominate the back seat, the Graco Junior Maxi looks modern, compact, and stylish while still offering plenty of protection and comfort. Overall, the Graco Junior Maxi i-Size R129 Highback Booster is a brilliant choice for families wanting safety, comfort, convenience, and long-term value all in one. It’s reliable, child-friendly, and genuinely makes travelling smoother for everyone involved. A practical investment that both parents and children will appreciate every single day.
R**K
perfekt
Bra smidig stol
M**A
Perfect
My kids are already 4 and 5 so the eggshells were not comfortable for them. This seats are perfect, comfortable, easy to keep clean. Will stay with us many years for sure.
R**6
Günstig und trotzdem stabil und zuverlässig
Preiswert und trotzdem sehr gut. Das Kopfteil kann in der Höhe verstellt werden und hat auf jeder Seite einen Becher/Flaschenhalter. Das Kind wird durch den normalen Gurt, der oben im Schulterbereich durch eine Gurt-Führung und über den Hüftbereich geführt wird, fixiert. Der Sitz ist leicht doch durch den Gurt wird er sehr gut befestigt. Bin sehr zufrieden damit
J**R
Bilstol till vettiga pengar
Jag köpte denna barnstolen eftersom barnbarnet blivit för stor för att åka i bakåtvänd bilstol. Barnets far monterade denna stolen på plats och enligt honom är stolen perfekt! Barnbarnet är nöjd, barnets far är nöjd och min fru är jättenöjd så då kan betyget bara bli full pott!
C**E
Aisé à monter, à transporter, et confortable, combo gagnant !
Siège rehausseur acheté pour mon fils qui fait 1 m 38. Le montage est intuitif, le siège est léger à transporter et dispose d'un appui-tête facilement réglable grâce à une poignée. Sur un trajet en voiture de 2 fois 10 heures, mon fils s'est senti assez à l'aise. Je recommande.
Trustpilot
2 months ago
1 month ago