My DS is nearly 15 months old - and is a sooky toddler!!! I got myself a Bubba Moe about a month ago - and OMG.. what a lifesaver... they have a weight limit of about 16-17kg? He is only 11kg so can carry him around for a while. We use it whilst shopping and its big enough for my DH to carry him around as well - we've used it for quite a few hours, and its quite comfy. I've vaccuumed the house with him on my back - cos you can carry them on your hip, or slide them around to on your back. I usually give him a biscuit or something, strap him on, slide him around and I can do whatever I like...
I'd recommend a Bubba Moe to anyone... plus... hopefully he will be out of the sooky stage in a few months, and I can use it for my newborn too.