Oh, ewww...help!

Really, I mean it, I need help. I'm on my third round of damn mealy bugs in as many months. Well, I call them mealy bugs but Googling tells me I'm wrong, they're weevils or mill bugs. Maybe. Who knows. Whatever they're called, they're those little, tiny black bugs that get into flour, rice and pasta. I've cleaned my hutch out entirely each time, disinfected, thrown out anything infected and when I open a box of, say, pasta, I always store the remainder in a Zip-Loc bag. In the past, scattering bay leaves has taken care of them but not this time - they just keep on coming back, in pure defiance of my bay leaves. So, does anyone have any ideas on what I can do to prevent this from happening a 4th time? This time, they actually were inside a couple of Zip-Loc bags and I'm sort of freaked out by that. I'd appreciate any ideas...please!