I think there's a brand called furarri... or something like that. They are plastic crates and instead of having to undo all the screws like with a vari kennel, they have snaps. So easy to undo and put back together... I'll have a look and see if I can get the exact name....

Edit:
Here's the one I mean...
http://www.canvasbackpets.com/ShopSite/product325.html