Thanks everyone for your ideas!

Jungle Mum - We're heading over to WA, it should be fun! We'd love to do a bigger trip one day . We will definitely need bags, otherwise all our stuff will be mixed up and hard to find. It will be easier to just grab a bag of DD's and the boy's stuff and shove it back I think.

ControlFreak - Thank you so much for the links, you rock! We have a Howards Storage not far from us so I will definitely go and check them out. I need to make sure the dimensions will fit where we need them to go.

Sopdet - I looked on the Ikea website yesterday, but didn't see anything suitable. I might check out Bunnings though.

Thanks again everyone, I really appreciate it!