@chai2,
"If you have moths, you must keep everything...especially flour, pasta, cereals & breads...in airtight containers. I keep flour inside a ziplock bag inside a canister. Ziplock bags work great.
Can you put the canister inside a ziplock bag?"
I think you can get bags big enough to stand in while you put your zipper-bag filled canister in a zipper bag, but that
might be overkill. These are seriously nasty insects that are difficult to eliminate!