Safety 1st - Jive 2-in-1 Convertible Car Seat

Yup, I bought the lightest and most narrow car seat I could find just for travelling. Also got a collapsible cart for it so I can wheel it through the airport, often with the kid in it.

Safety 1st Jive 2-in-1 Convertible Car Seat Holm Airport Car Seat Stroller Travel Cart and Child Transporter - there are probably better carts out there, but so far this one has worked for us so far.

The Scenera next does have a 40lb limit so most kids outgrow it around 3-4. But for $60 each it’s still a great value unless your kiddos are upper percentile and really would only get one use out of it. The Safety 1st Jive/Cosco Mightyfit LX (same seat with slightly different covers) are another solid travel option, slightly harder to install than the Scenera Next but last to 65lbs forward facing so several years longer than the Scenera Next. They’re about a pound heavier. There are a lot of car seat backpack options on Amazon! Couldn’t tell you which specific one I have but I imagine most of the random brand ones are all identical with different branding lol

Safety 1st Jive/Cosco Mightyfit LX (same seat with different inserts), Graco contender Go/Slim/65 (same seats with different cupholders). The Cosco Finale is another popular choice but has a 30lb weight minimum.