My ds is 2 and 24 lb. We love the sling, but he's really getting too heavy for it--every time he's in more than 20 min, my back hurts for days afterwards. Anyway, I'm really considering getting a sutemi or ergo back carrier, but am wondering if this will be better for my back or if I'm wasting my time. I'm starting to think maybe he's outgrown being carrier, but I refuse to be tied to my stroller since dh and I enjoy hiking and walking really long distances and ds is too young to walk the entire way. Let me know what your opinions are please!!!