DS is going to be 1 next week (where did that go?!) and I want a sling for carrying him on my hip - hands-free if at all poss. I don't like the Hippychick hip seat and I don't like the Quinny Curbb as the strap really cuts into my neck. I've seen a nice one that carries up to 18 months old, but want one that's going to last longer than that, ideally. Any suggestions, ladies?