Mattress for little ones

We are about to take our two year old camping for the first time and I figure if I'm buying him a mat I may as well get him something I can carry down the track once he starts to hit the trail with me. What sort of inflatable mattresses are people using with their kids? El cheapos or something decent. I was thinking a short neoair or exped synmat as the length will last him for eons and it will be obviously warmer than just an air bed. If anyone has any good recommendations on a sleeping bag as well I'd love to hear them though at the moment I'm fairly sold on the new kiddies down sleeping bag from macpac.
. http://www.macpac.com.au/shop/en_au/gea ... ngbag.html
I should add we are in Sydney so mostly camping here and blue mountains though when he's old enough a nice trip to rainbow lake in the snowies etc will be on the cards.
Thanks
Mic

I should add we are in Sydney so mostly camping here and blue mountains though when he's old enough a nice trip to rainbow lake in the snowies etc will be on the cards.

Thanks
Mic