I have had great success storing GY baits in the waterproof Plano boxes. I keep rigged GY baits in one box and unrigged GY baits in a second box.
Definitely do not mix different brands in the same container, I have experienced them melting and becoming a gooey unusable mess. My guess is that it's some kind of chemical reaction. I have also heard that some manufacturers use different ingredients in their baiits which will lead to the same gooey mess.
My method works for me as I fish Yamamotos exclusively.
Hope this helps. Cheers and tight lines, Jim