I live in Georgia (hot and humid in the summer) and I starch using a homemade formula (corn starch and water). I have never had a problem with bugs when I've stored starched fabric. I'm not saying it's not possible to have a problem, but in ten years of storing starched fabric, I haven't yet. Still, if it concerns you I would try the rubbermaid container idea. Sounds like a good way to keep the top fresh all the way around.
