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).

ProductWhyWidthWeightLower anchors
1. Britax UpNGo sold by lovemedobaby.comThe slim SpaceSaver design is 17.1 in wide and is meant to leave more room for siblings or carpoolers.The booster measures 39.4 cm x 43.4 cm x 22.9 cm (15.5 in x 17.1 in x 9 in). guideBritax describes the booster as weighing under 4 lb. guideConsumer 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 sold by lovemedobaby.comOutside dimensions are 39.4 cm long, 43.4 cm wide and 22.9 cm high (15.5 x 17.1 x 9 in).Outside dimensions are 39.4 cm long, 43.4 cm wide and 22.9 cm high (15.5 x 17.1 x 9 in). guideIt weighs under 5 lb and is intended to be easy for caregivers and children to carry. guideThe Click model has rigid steel LATCH connectors that click in and release in seconds. guide

Also cited in the text

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.