---
product_id: 682468124
title: "Britax One4Life Slim All-in-One Car Seat, 10 Years of Use, 17.5” SpaceSaver Design, Converts from Rear-Facing Infant Car Seat to Forward-Facing Booster Seat, ClickTight Installation, Mineral Gray"
brand: "britax"
price: "$2695"
currency: NZD
in_stock: true
reviews_count: 5
category: "Britax"
url: https://www.desertcart.nz/products/682468124-britax-one4life-slim-all-in-one-car-seat-10-years
store_origin: NZ
region: New Zealand
---

# 10-year all-in-one convertible use ClickTight 3-step secure install 17.5” SpaceSaver slim design Britax One4Life Slim All-in-One Car Seat, 10 Years of Use, 17.5” SpaceSaver Design, Converts from Rear-Facing Infant Car Seat to Forward-Facing Booster Seat, ClickTight Installation, Mineral Gray

**Brand:** britax
**Price:** $2695
**Availability:** ✅ In Stock

## Summary

> 🚗 Elevate every ride with the Britax One4Life Slim—where safety meets sleek, smart design.

## Quick Answers

- **What is this?** Britax One4Life Slim All-in-One Car Seat, 10 Years of Use, 17.5” SpaceSaver Design, Converts from Rear-Facing Infant Car Seat to Forward-Facing Booster Seat, ClickTight Installation, Mineral Gray by britax
- **How much does it cost?** $2695 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.nz](https://www.desertcart.nz/products/682468124-britax-one4life-slim-all-in-one-car-seat-10-years)

## Best For

- britax enthusiasts

## Why This Product

- Trusted britax brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Space-Smart Design:** Slim 17.5” width fits 3 across* without sacrificing premium comfort or safety.
- • **Premium Comfort & Cooling:** Soft knit recycled fabric, mesh cooling channels, and plush padding for happy rides.
- • **All-in-One Growth Champion:** From newborn to booster—one seat, 10 years of trusted safety and comfort.
- • **Effortless ClickTight Installation:** Pinch, thread, buckle, click—install with confidence in just 3 simple steps.
- • **One-Hand Adjustable Harness & Recline:** 15-position no-rethread harness and 9-position recline with easy-read indicators.

## Overview

The Britax One4Life Slim All-in-One Car Seat is a versatile, space-saving solution designed to grow with your child from 5 to 120 lbs over 10 years. Featuring ClickTight installation for foolproof setup, a slim 17.5” width to fit 3 across in most vehicles, and premium comfort with cooling mesh and recycled knit fabric, it combines trusted Britax safety technologies like SafeCell and a high-strength steel frame with user-friendly adjustments and easy cleanup. Ideal for the modern parent seeking long-term value without compromising style or security.

## Description

The One4Life(R) Slim all-in-one car seat takes your child from birth to big kid with trusted Britax safety, ClickTight(R) installation, and a slim SpaceSaver(TM) design. As a convertible and harness-2-booster seat in one, it grows with your child for 10 years. It starts rear-facing with an extended capacity of up to 50 lbs., so your child can ride rear-facing longer. It easily converts to forward-facing toddler mode (up to 65 lbs.) and high-back belt-positioning booster mode (up to 120 lbs.) when your child is ready. With a slim outside and spacious inside, the 17.5” seat is designed to fit 3 across* without compromising safety and comfort. ClickTight helps you install with confidence, every time. The base and shell are easy to wipe down for hassle-free cleanup. The car seat cover is safe to machine wash and dry, and it’s naturally flame-retardant with no added FR chemicals. One4Life Slim features a high-strength steel frame, a SafeCell(R) crumple zone, and a V-shaped tether. As your child grows, you can easily adjust the 15-position no-rethread harness and headrest with one hand. With cooling channels, premium padding, three infant inserts, and built-in armrests, your child will love every ride. *Britax cannot guarantee 3-across fitment in all vehicles.

Review: Safety - I’ll give it 5 stars for safety but it’s very hard to get the baby buckled in because straps are short and can’t be lengthened or let out. My baby is 2 and as she grows I’ll probably have to buy another car seat because of the length of harness straps.
Review: Overall great - Overall, i love this car seat. it’s strong and sturdy. my only complaints are that, if snacks fall in the checkered area, they’re almost impossible to get out. Also, we went on a 7 hour drive with plenty of stops and my 2 year old was complaining her butt hurt. Other than that, it’s great and i know she’s safe!

## Features

- All-in-One Car Seat: One4Life(R) Slim is a convertible and harness-2-booster seat in one! It easily converts from a rear-facing infant and toddler seat (5-50 lbs.) to a forward-facing seat (30-65 lbs.) to a high-back booster seat (40-120 lbs.)
- ClickTight(R) Installation: Install with confidence in 3 easy steps: pinch to open, thread and buckle, click it closed!
- SpaceSaver(TM) Design: Slim outside, spacious inside! The 17.5” 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
- Premium Car Seat Cover: Features a soft knit fabric with woven mélange accents that are made from recycled polyester; the cover is safe to machine-wash and dry and naturally flame retardant with no added FR chemicals
- Trusted Britax Safety: Features a patented V-shaped tether, SafeCell(R) technology, a high-strength steel frame, and two layers of energy management
- Comfortable Rides: This slim car seat includes soft comfort pads, built-in mesh cooling channels, three infant inserts, plush padding, and a tag-free headrest
- Easy to Adjust: The 15-position no-rethread harness and headrest adjust together easily with one hand, and the 9-position recline has an easy-read indicator to help you find the correct angle for your vehicle
- Slide-Out Cup Holders: The dishwasher-safe cup holders slide out with ease for convenient cleaning and click back into place for a secure attachment during rides
- Accessible Color-Coded Belt Paths: Make it easy to route the seat belt through the correct path for each car seat mode
- Hassle-Free Cleanup: Extra space between the shell and base means you can clean under the seat with ease – and with minimal grooves in the seating area and base, you can wipe it down with no fuss

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0DPLJRD8Y |
| Age Range Description | Kid |
| Best Sellers Rank | #3,769 in Baby ( See Top 100 in Baby ) #19 in Convertible Child Safety Car Seats |
| Brand | Britax |
| Color | Mineral Gray |
| Customer Reviews | 4.7 4.7 out of 5 stars (11) |
| Forward Facing Car Seat Minimum Height | 35 Inches |
| Forward Facing Maximum Weight | 120 Pounds |
| Forward Facing Minimum Weight | 30 Pounds |
| Harness Type | 5-Point |
| Infant Toddler Car Seat Type | Convertible Car Seat |
| Installation Type | Seat Belt |
| Item Dimensions D x W x H | 18.5"D x 17.5"W x 24.5"H |
| Item Weight | 28 Pounds |
| Manufacturer | Britax USA |
| Material Type | Alloy Steel, Plastic |
| Maximum Height Recommended | 49 Inches |
| Maximum Weight Recommendation | 120 Pounds |
| Minimum Height Recommendation | 18 Inches |
| Minimum Weight Recommendation | 5 Pounds |
| Number of Height Positions | 15 |
| Orientation | Rear and Forward Facing |
| Rear Facing Car Seat Maximum Height | 49 Inches |
| Rear Facing Maximum Weight | 50 Pounds |
| UPC | 652182750008 |
| Unit Count | 1.0 Count |

## Product Details

- **Brand:** Britax
- **Color:** Mineral Gray
- **Installation Type:** Seat Belt
- **Material:** Alloy Steel, Plastic
- **Orientation:** Rear and Forward Facing

## Images

![Britax One4Life Slim All-in-One Car Seat, 10 Years of Use, 17.5” SpaceSaver Design, Converts from Rear-Facing Infant Car Seat to Forward-Facing Booster Seat, ClickTight Installation, Mineral Gray - Image 1](https://m.media-amazon.com/images/I/81BaqeJpe6L.jpg)
![Britax One4Life Slim All-in-One Car Seat, 10 Years of Use, 17.5” SpaceSaver Design, Converts from Rear-Facing Infant Car Seat to Forward-Facing Booster Seat, ClickTight Installation, Mineral Gray - Image 2](https://m.media-amazon.com/images/I/91tiHGZC1bL.jpg)
![Britax One4Life Slim All-in-One Car Seat, 10 Years of Use, 17.5” SpaceSaver Design, Converts from Rear-Facing Infant Car Seat to Forward-Facing Booster Seat, ClickTight Installation, Mineral Gray - Image 3](https://m.media-amazon.com/images/I/911F61K5LrL.jpg)
![Britax One4Life Slim All-in-One Car Seat, 10 Years of Use, 17.5” SpaceSaver Design, Converts from Rear-Facing Infant Car Seat to Forward-Facing Booster Seat, ClickTight Installation, Mineral Gray - Image 4](https://m.media-amazon.com/images/I/91VFJ75iI2L.jpg)
![Britax One4Life Slim All-in-One Car Seat, 10 Years of Use, 17.5” SpaceSaver Design, Converts from Rear-Facing Infant Car Seat to Forward-Facing Booster Seat, ClickTight Installation, Mineral Gray - Image 5](https://m.media-amazon.com/images/I/81a1Cixi1ZL.jpg)

## Available Options

This product comes in different **Color, Style** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Safety
*by D***E on December 5, 2025*

I’ll give it 5 stars for safety but it’s very hard to get the baby buckled in because straps are short and can’t be lengthened or let out. My baby is 2 and as she grows I’ll probably have to buy another car seat because of the length of harness straps.

### ⭐⭐⭐⭐ Overall great
*by B***E on December 11, 2025*

Overall, i love this car seat. it’s strong and sturdy. my only complaints are that, if snacks fall in the checkered area, they’re almost impossible to get out. Also, we went on a 7 hour drive with plenty of stops and my 2 year old was complaining her butt hurt. Other than that, it’s great and i know she’s safe!

### ⭐⭐⭐⭐⭐ Quality
*by A***R on January 1, 2026*

Very nice love it 5+++

## Frequently Bought Together

- Britax One4Life Slim All-in-One Car Seat, 10 Years of Use, 17.5” SpaceSaver Design, Converts from Rear-Facing Infant Car Seat to Forward-Facing Booster Seat, ClickTight Installation, Mineral Gray
- Britax Anti-Rebound Bar Accessory - Compatible with Britax One4Life Car Seats , Black
- Britax Car Seat Waterproof Liner - Moisture Wicking Fabric + No Slip Grip + Machine Washable + Crash Tested

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*Product available on Desertcart New Zealand*
*Store origin: NZ*
*Last updated: 2026-03-03*