I keep the spices in their original packaging, but put these inside a resealable plastic sandwich bag (e.g. "snaplock") and squeeze the air out of them before sealing them.
I then put these inside a sealable plastic box (e.g. "Tupperware"). Then store in a cool cupboard. Works fine for me. I reckon powders are good for several months stored this way and whole spices even longer.
Of course, you can't beat a nice stainless steel "Dabba" like Layne has!

I'm sure BIRs do not freshly roast and grind their spices as well Panpot....time = money after all!
