My eight-year old son updated to this backpack for his first overnight backpacking trip. He was ecstatic getting this pack. Now, he has a 21" waist, and it barely fit him. There's no way any of our kids could have fit this pack at 5 or 6 years of age, so if you have petite or slim children keep this in mind. On the plus side, he will be able to use this backpack for many years to come.
We loaded it up, and he hiked up and down, over dunes and down the beach with no complaints. It was a great and memorable trip, and he was genuinely thrilled with his Kelty pack.
As a side note: There are two internal bars inside this pack that keep that compartment open. These bars must be attached to the outside, external bar thru two small slits in the pack PRIOR to use. I almost missed this when setting up my sons backpack. If you missed this step the bars could poke through the pack potentially causing a problem.