# Booster seats for three across in one back seat Which booster seats are narrow enough to fit three across in one back seat? Britax UpNGo: The slim SpaceSaver design is 17\.1 in wide and is meant to leave more room for siblings or carpoolers\. Britax UpNGo Click: Outside dimensions are 39\.4 cm long, 43\.4 cm wide and 22\.9 cm high \(15\.5 x 17\.1 x 9 in\)\. ### 1. [Britax UpNGo](/products/ucp/lovemedobaby-com/7538921570438) (sold by lovemedobaby\.com) The slim SpaceSaver design is 17\.1 in wide and is meant to leave more room for siblings or carpoolers\. - Width: The booster measures 39\.4 cm x 43\.4 cm x 22\.9 cm \(15\.5 in x 17\.1 in x 9 in\)\. (guide) - Weight: Britax describes the booster as weighing under 4 lb\. (guide) - Lower anchors: Consumer Reports lists low weight, flame\-retardant\-free fabric, LATCH securement, an included belt clip and a removable cover as strengths\. (review) ### 2. [Britax UpNGo Click](/products/ucp/lovemedobaby-com/7538920718470) (sold by lovemedobaby\.com) Outside dimensions are 39\.4 cm long, 43\.4 cm wide and 22\.9 cm high \(15\.5 x 17\.1 x 9 in\)\. - Width: Outside dimensions are 39\.4 cm long, 43\.4 cm wide and 22\.9 cm high \(15\.5 x 17\.1 x 9 in\)\. (guide) - Weight: It weighs under 5 lb and is intended to be easy for caregivers and children to carry\. (guide) - Lower anchors: The Click model has rigid steel LATCH connectors that click in and release in seconds\. (guide) ## Also cited in the text - Britax UpNGo, width and sibling room: The slim SpaceSaver design is 17\.1 in wide and is meant to leave more room for siblings or carpoolers\. (guide) Every value in the table is a fact RoboTrunk checked, linked to the page it came from\. A dash means no checked fact fills that cell\. Prices and stock change, so this page prints neither: each product name links to its RoboTrunk page, which shows them live\. Written 2026-10-26T20:42:41.760Z. This page is published by RoboTrunk, a store built for shopping agents. The store named on this page sells the product and ships it. RoboTrunk is not the seller and never holds the money. Buying works in one path. RoboTrunk's tools prepare a checkout at that store, then hand back a short-lived link. The person approves the total; once RoboTrunk has checked the store's total against it, the person is given the checkout link to tap in their own browser, or, if the person prefers and gives permission, their agent may open the link and finish there, and payment always happens on the store's own checkout page. RoboTrunk never takes the payment or sees a card. Where the rest of this site is: - /agent/story.md is what RoboTrunk is and how it works, in full. - /agent/tools.json is every tool, its arguments and its answers. - /agent/merchants is every store you can buy from through RoboTrunk. - /products/ucp is every store's indexed products. - /products/search is one search across every store, in plain words. - [What RoboTrunk is](/agent/story.md) - [Every tool, in your browser through WebMCP](/agent) - [The tools and how to call them](/agent/tools.json) - [The stores you can buy from](/agent/merchants) - [Every store's products](/products/ucp) - [Search every store at once](/products/search)