--- product_id: 545537620 title: "Junior Maxi™ i-Size R129 Child's Booster Seat, Height Adjustable Armrests and Headrest, Approx. 3.5 to 12 Years (100 to 150 cm), Black, Midnight" brand: "graco" price: "AR$2576539" currency: ARS in_stock: true reviews_count: 13 category: "Graco" url: https://www.desertcart.com.ar/products/545537620-junior-maxi-i-size-r129-childs-booster-seat-height-adjustable store_origin: AR region: Argentina --- # 10-position adjustable headrest Retractable dual cupholders Lightweight 3.49 kg design Junior Maxi™ i-Size R129 Child's Booster Seat, Height Adjustable Armrests and Headrest, Approx. 3.5 to 12 Years (100 to 150 cm), Black, Midnight **Brand:** graco **Price:** AR$2576539 **Availability:** ✅ In Stock ## Summary > 🚗 Elevate every ride with safety, style, and smart convenience! ## Quick Answers - **What is this?** Junior Maxi™ i-Size R129 Child's Booster Seat, Height Adjustable Armrests and Headrest, Approx. 3.5 to 12 Years (100 to 150 cm), Black, Midnight by graco - **How much does it cost?** AR$2576539 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.com.ar](https://www.desertcart.com.ar/products/545537620-junior-maxi-i-size-r129-childs-booster-seat-height-adjustable) ## Best For - graco enthusiasts ## Why This Product - Trusted graco brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Clean & Convenient:** Machine-washable seat pad ensures your car seat stays fresh and stylish in sleek Midnight fashion. - • **Stay-Ready Hydration:** Dual retractable cupholders keep drinks secure and within easy reach, making every trip spill-free. - • **Effortless Portability:** At just 3.49 kg, this booster is lightweight yet sturdy—perfect for busy parents on the move. - • **Safety That Speaks R129:** Meets and exceeds rigorous R129 i-Size safety standards for peace of mind on every journey. - • **Grow-With-Confidence Comfort:** One-hand, 10-position adjustable headrest adapts seamlessly as your child grows from 100 to 150 cm. ## Overview 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. ## Description Safely transport your big kid with R129. The lightweight Junior Maxi™ R129 highback booster allows your "big kid" to travel safely from 100-150cm (approx. 3.5 to 12 years). The Junior Maxi™ R129 features a one-hand, 10-position adjustable headrest allowing parents to quickly and easily adjust the height of the headrest as the child grows. The two hideaway cupholders hold beverages and offers a machine-washable cover. The Junior Maxi™ R129 has been rigorously tested to meet or exceed all applicable R129 regulations. Review: 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. Review: 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. ## Features - R129 highback booster car seat - Suitable from 100-150cm (3.5 to approx. 12 years) - 10-position height-adjustable head rest - Soft cushioned seatpad - Retractable cupholders - Open-loop belt guides to help ensure proper seat belt positioning ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0BMGNDJHV | | Age Range Description | Kid | | Best Sellers Rank | 146 in Baby Products ( See Top 100 in Baby Products ) 1 in Car Seats (Baby Products) | | Brand Name | Graco | | Colour | Midnight | | Country Of Origin | China | | Customer Reviews | 4.7 4.7 out of 5 stars (2,963) | | 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 | | 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 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 | | Unit Count | 1 Case | ## Product Details - **Brand:** Graco - **Colour:** Midnight - **Harness type:** 3-Point - **Installation type:** Seat Belt - **Item weight:** 3.49 Kilograms - **Material:** Alloy Steel, Polyester, Polypropylene - **Maximum weight recommendation:** 36 Kilograms - **Number of height positions:** 10 - **Orientation:** Forward Facing - **Product dimensions:** 53.7D x 40.8W x 81.7H centimetres ## Images ![Junior Maxi™ i-Size R129 Child's Booster Seat, Height Adjustable Armrests and Headrest, Approx. 3.5 to 12 Years (100 to 150 cm), Black, Midnight - Image 1](https://m.media-amazon.com/images/I/514ldEDtyVL.jpg) ## Available Options This product comes in different **Color** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Very good seat and great value *by C***A on 12 January 2026* 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. ### ⭐⭐⭐⭐⭐ Fantastic seat for 15kg and over *by R***N on 31 May 2025* 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. ### ⭐⭐⭐⭐ Decent car seat *by C***R on 2 March 2026* Good value car seat. Lightweight and seems fairly sturdy. Only negative is it looks like the material may rub up easily. ## Frequently Bought Together - Graco Junior Maxi i-Size R129 Highback Booster car seat with cupholders, Suitable from 100-150cm (approx. 3.5 to 12 years), Midnight fashion - URAQT Car Seat Belt Pads, 2 Pack Harness Pads, Pram Strap Covers, Backpack Shoulder Pad, Multifunctional Seat Belt Pad Cover for Kids and Adults - My Child Brundle Group 2/3 Booster, Grey, 700 g --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.com.ar/products/545537620-junior-maxi-i-size-r129-childs-booster-seat-height-adjustable](https://www.desertcart.com.ar/products/545537620-junior-maxi-i-size-r129-childs-booster-seat-height-adjustable) --- *Product available on Desertcart Argentina* *Store origin: AR* *Last updated: 2026-05-15*