Yes, Bubblebum booster. We have 2 for our kids for only cruise travel. Otherwise 5yo is harnessed. There are some issues with some of the bladders leaking but the company is easy to work with and will send out a replacement easily and quickly. 1 was fine, the other leaked.
Thank you for this tip, never occurred to me that these things existed..... Much better than carrying car seats trying to balance them on your carryon while in the airport or carrying them on the plane, or worse checking them in... No more going to the damaged bag counter
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