Yeah, that stuff. I had about 500 floppies in a cardboard box, a single "pillow" and 2 tied plastic bags protecting the lot. So far all the viruses has survived. (Only partly a joke.) In reality i could have gotten away with saving 10-15 floppies, Octamed, mod's & samplings. But at least i got loads of floppies i can format and use for what ever.
When shopping silica-gel, get the color-changing stuff. And remember, it's never "used up" just toss it in a hot dry place for a few hours. Like the sauna when preheating it, or the oven after baking. Just over boiling, for a couple of hours. The stuff in the paper bags generally isn't color changing, so just regenerate it before use, just in case.