well, 15kg is pretty hefty My DS doesn't even weigh that. Still, at around 14kg he is practically weightless in my beetlebums. There are sooooo many options out there. The hard part is just finding the one that's perfect for you. Those with back problems probably would need to be a little pickier about what they choose, but I think many can still find something comfortable.

Kaytee, I'm certain you can find something that would suit