# Convertible car seats and inflatable seat belts Which convertible car seats work with inflatable seat belts, and what should a buyer know before installing one? PEG Primo Viaggio Convertible Kinetic: Do not use with an inflatable shoulder belt\. Cybex Gold Eternis S Sensor Safe All\-In\-One Car Seat: The rear\- and forward\-facing lock\-offs are one\-way, buried in the belt path and difficult to use\. They need lots of slack and a flossing motion; the technique that worked differed from the manual's pull\-down instruction\. First installations are difficult, though the lock\-offs loosen with repeated use\. ### 1. [PEG Primo Viaggio Convertible Kinetic](/products/ucp/albeebaby-com/9612563349735) (sold by albeebaby\.com) Do not use with an inflatable shoulder belt\. - Inflatable belt: Do not use with an inflatable shoulder belt\. (manual) - Installation notes: The reviewer says the Easy\-Tight LATCH system is straightforward, though some parents may still need time to adjust everything\. (review) - Weight limits: The reviewer states rear\-facing 5–45 lbs and forward\-facing 26\.5–65 lbs, matching the US manual\. (review) ### 2. [Cybex Gold Eternis S Sensor Safe All\-In\-One Car Seat](/products/ucp/megababiesusa-com/6761164505241) (sold by megababiesusa\.com) The rear\- and forward\-facing lock\-offs are one\-way, buried in the belt path and difficult to use\. They need lots of slack and a flossing motion; the technique that worked differed from the manual's pull\-down instruction\. First installations are difficult, though the lock\-offs loosen with repeated use\. - Inflatable belt: - - Installation notes: The rear\- and forward\-facing lock\-offs are one\-way, buried in the belt path and difficult to use\. They need lots of slack and a flossing motion; the technique that worked differed from the manual's pull\-down instruction\. First installations are difficult, though the lock\-offs loosen with repeated use\. (review) - Weight limits: Rear\-facing is 4\-50 lb, forward\-facing with harness is 22\-65 lb, and belt\-positioning booster is 40\-120 lb\. (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 2026-10-20T08:34:07.081Z. 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)