I bought this backpack harness for international plane travel with my active two-year-old. I liked that this one holds a bit more than some of the other backpack harnesses out there, so she could have a favorite stuffed animal or toys.  My daughter actually asks to wear it and the leash can be removed for those times.  Luckily haven't actually had to leash her more than a couple of times but, I was relieved to have this during our travels.