I have used both hug-a-bub and ergo.

I had the hug-a-bub with my first. Because it is strechy material, I found too many wriggles and it had to be adjusted. Also in summer (she is a feb baby) it was tooooo hot. But i love it's washability and simplicity.

When I was pregnant with number two, the ergo hit the market. I hot me one of those quick smart! Best investment EVER!

I can carry my 4 year old in it very comfortable (if I have to) she is 15.5 kgs. It is good up to 18 kgs.

My 18 mths old regularly rides on my back in it. and compared to the hugabub - sooo much better.

Since i got mine, new models have come out, including a lighter weight one, which is good in summer.

You can get them through Mother's Direct (discount if ABA member)