Neat idea, way to go! I too carried a Kelty around for years with my kids. They are too big and carry their own packs now. The only thing I noticed that might be an issue is they are sitting so low that they are staring right at your back which is only a couple inches from their face. Especially the little one. The nice thing about the Kelty or similar kid carrier packs is they sit up high where they can see around. I'm thinking a little one would get pretty cranky for any extended trip having to sit that close and staring at your back all the time? I wonder if they could ride backwards in it so they get a better view? I like Dotmans idea of attaching the Kelty to his Kifaru. I'd be trying that if I was still carrying little ones around!