Hey Cuppa,
Next time you're down in Melbourne, check out one of the Paddy Pallin stores. They have great collapsible wine glasses. It's the only place I've seen them. I keep a couple in the truck.
I'm out at the moment but I'll put up a pic a bit later once I get home..
BTW, I only ever take beer cans. I hate having glass with me, it's a PITA.
Tip tip tip......tap tap tap....