I am looking for a lightweight harnessed booster for travel/ extra seat for my 4.5 year old daughter. We are flying next month and renting a car, so it would initially be for that, then would go in my husband’s car and move her britax into the nanny’s car.

She is 4 yrs old weighs 39 lbs, about 42 in tall.

I was thinking of a maestro, but babies r us was sold out in the store.

Thank you.