Hi Lisa,
Congratulations!
Have you looked at kinderkots? I have them for my 2.5yr old triplets, they are like a pop up dome tent and fold up small and only weigh 3kg each, they have a self inflatable mattress which fits into the base. check them out online at kinderkot.com.au (I think) or google kinderkot.
Best wishes, Olivia
Cheers,
Olivia
Clancy, Will and Tom 15/6/07