So my family will be traveling to Japan later this year. We have a 1 year old and 4 year old. Japan's streets are not very stroller friendly, and therefore, I'm definitely bringing my Boba carrier. However, my 1 year old is 23 pounds. I was considering buying those hiking backpack carriers. They look very convenient. A popular brand I've seen on Amazon are Kelty. Anyone have any experience with them?