# Convertible car seats and front\-seat room Which convertible car seats take up the least space in front of the vehicle's front seat? Cybex Callisto G 360 Select: The seat measures 21\.7 inches long by 19\.5 inches wide by 25\.5–35 inches high and weighs 35 pounds\. The hands\-on review says the Callisto family is relatively compact front\-to\-back for a rotating seat and often clears protruding, non\-removable vehicle headrests, but its width makes adjacent seating or three\-across arrangements difficult\. Graco SlimFit 3\-in\-1 Narrow All\-in\-One Convertible Car Seat: Rotating cup holders rotate away to make the seat about 10% slimmer\. Britax Poplar Convertible Car Seat: On a flat surface, the seat is about 28\.5 inches long when reclined, but installed length varies with the vehicle seat and other factors\. Britax Poplar: It is approximately 28\.5 inches \(72\.39 cm\) long when reclined on a flat surface; vehicle geometry can change the installed measurement\. Britax Poplar S: It is 17 in \(43\.18 cm\) wide and approximately 28\.5 in \(72\.39 cm\) long when reclined on a flat surface; installed length varies with the vehicle seat\. The black base runners must rest entirely flat on the vehicle seat, and up to 3 inches \(7\.5 cm\) of the base may overhang the front in either orientation\. ### 1. [Cybex Callisto G 360 Select](/products/ucp/anbbaby-com/9849520488734) (sold by anbbaby\.com) The hands\-on review says the Callisto family is relatively compact front\-to\-back for a rotating seat and often clears protruding, non\-removable vehicle headrests, but its width makes adjacent seating or three\-across arrangements difficult\. - Dimensions: The seat measures 21\.7 inches long by 19\.5 inches wide by 25\.5–35 inches high and weighs 35 pounds\. (guide) - Width: The seat measures 21\.7 inches long by 19\.5 inches wide by 25\.5–35 inches high and weighs 35 pounds\. (guide) - Front clearance: The hands\-on review says the Callisto family is relatively compact front\-to\-back for a rotating seat and often clears protruding, non\-removable vehicle headrests, but its width makes adjacent seating or three\-across arrangements difficult\. (review) ### 2. [Graco SlimFit 3\-in\-1 Narrow All\-in\-One Convertible Car Seat](/products/ucp/albeebaby-com/9564451504359) (sold by albeebaby\.com) Rotating cup holders rotate away to make the seat about 10% slimmer\. - Dimensions: - - Width: Rotating cup holders rotate away to make the seat about 10% slimmer\. (listing) - Front clearance: - ### 3. [Britax Poplar Convertible Car Seat](/products/ucp/anbbaby-com/9925032968478) (sold by anbbaby\.com) On a flat surface, the seat is about 28\.5 inches long when reclined, but installed length varies with the vehicle seat and other factors\. - Dimensions: The retailer lists overall dimensions of 20\.5 × 17 × 23\.5 inches and a 17\-inch design width\. (guide) - Width: The retailer lists overall dimensions of 20\.5 × 17 × 23\.5 inches and a 17\-inch design width\. (guide) - Front clearance: On a flat surface, the seat is about 28\.5 inches long when reclined, but installed length varies with the vehicle seat and other factors\. (manual) ### 4. [Britax Poplar](/products/ucp/anbbaby-com/8833528234270) (sold by anbbaby\.com) It is approximately 28\.5 inches \(72\.39 cm\) long when reclined on a flat surface; vehicle geometry can change the installed measurement\. - Dimensions: It is approximately 28\.5 inches \(72\.39 cm\) long when reclined on a flat surface; vehicle geometry can change the installed measurement\. (guide) - Width: The seat is 17 inches \(43\.18 cm\) wide\. (guide) - Front clearance: - ### 5. [Britax Poplar S](/products/ucp/anbbaby-com/9925193335070) (sold by anbbaby\.com) The black base runners must rest entirely flat on the vehicle seat, and up to 3 inches \(7\.5 cm\) of the base may overhang the front in either orientation\. - Dimensions: It is 17 in \(43\.18 cm\) wide and approximately 28\.5 in \(72\.39 cm\) long when reclined on a flat surface; installed length varies with the vehicle seat\. (guide) - Width: It is 17 in \(43\.18 cm\) wide and approximately 28\.5 in \(72\.39 cm\) long when reclined on a flat surface; installed length varies with the vehicle seat\. (guide) - Front clearance: The black base runners must rest entirely flat on the vehicle seat, and up to 3 inches \(7\.5 cm\) of the base may overhang the front in either orientation\. (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 2026-10-10T03:14:14.822Z. 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)