# Car seats for three across in a back seat Which car seats fit three across in a vehicle's back seat? No checked fact confirms that any seat here fits three across\. Britax Poplar S: Sources disagree: Bemidjibest lists a 28 lb seat weight and 30–65 lb forward\-facing range, while BabyGearLab lists 26\.1 lb and the store lists 22–65 lb forward\-facing; the review also says it is not a booster, can be bulky front\-to\-back, and does not guarantee three\-across fit\. Britax Highpoint: no checked fact covers three\-across fit; the closest checked fact is a headrest finding in one vehicle: In a Honda Clarity with non\-removable, forward\-tilting headrests, a parent found the Highpoint left a gap behind the headrest like the manual’s disallowed example\. ### 1. [Britax Poplar S](/products/ucp/megababiesusa-com/8229311676670) (sold by megababiesusa\.com) Sources disagree: Bemidjibest lists a 28 lb seat weight and 30–65 lb forward\-facing range, while BabyGearLab lists 26\.1 lb and the store lists 22–65 lb forward\-facing; the review also says it is not a booster, can be bulky front\-to\-back, and does not guarantee three\-across fit\. - Three\-across note: Sources disagree: Bemidjibest lists a 28 lb seat weight and 30–65 lb forward\-facing range, while BabyGearLab lists 26\.1 lb and the store lists 22–65 lb forward\-facing; the review also says it is not a booster, can be bulky front\-to\-back, and does not guarantee three\-across fit\. (blog) - Width: The seat measures 17 inches wide, 23\.5 inches high and 20\.5 inches deep\. (guide) - Vehicle fit: Britax permits up to 3 inches of the base to extend beyond the front edge of the vehicle seat in either rear\- or forward\-facing mode\. (guide) ### 2. [Britax Highpoint](/products/ucp/megababiesusa-com/7930131906814) (sold by megababiesusa\.com) In a Honda Clarity with non\-removable, forward\-tilting headrests, a parent found the Highpoint left a gap behind the headrest like the manual’s disallowed example\. - Three\-across note: - - Width: - - Vehicle fit: In a Honda Clarity with non\-removable, forward\-tilting headrests, a parent found the Highpoint left a gap behind the headrest like the manual’s disallowed example\. (review) 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 2026-10-23T13:57:17.466Z. 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)