Powdered spices, don't "go bad" they just go stale if left open, this will take months to happen.
If your not bothered about aesthetics, used coffee jars are good storage, Ikea Droppar jars are good,
their Rajtan spice jars are very good and airtight.
I use them all, plus I received a spice carousel, xmas gift for my obsession, which is similar to the
Ikea Rajtan jars, but has shaker lids and it spins, Whoopdedoo. ;D ;D
Very neat and organised, compared to my spice shed LOL.

;D

Spice Shed


cheers Chewy