Okay, I give up! I've tried several soft type back packs and my skinny son seems to big for them (he's only 28-29lbs at 26 months!). I would love an ERGO, as I've heard they work well with toddlers too. I'm SHORT (five foot 2 inches) and frame style back packs (at least older models) always seem toooooo big for me), but if you have one that you think would work and would like to sell it, offer that up too!
