http://en.wikipedia.org/wiki/Tyvek
So a bit like Gore-tex, but a bit tougher and a bit more crinkly so not ideal for clothing...
It'll suck the moisture out of your food and not split and spill silica all over your yummy wheat put it that way
By the sounds of it the landlord must be a duckTrouble is the kitchen is an extension and a budget one at that I reckon, my landlord is tighter than... well he don't spend alot on maintenence or repairs put it that way.