What's the best way (outside of silica beads) to store filament sensitive to moisture? I feel like filament buried under a couple pounds of rice will stay pretty dry. I understand that frequently exposing the rice to humid air will cause the rice to less effective but I would only plan on opening the container to put a new spool in and replace the old one.
If you don't want to use silica beads, or can't get any (it seems to be a very American thing, you can't buy any here in France except if you go through a specialized reseller), you can put them in a sealable plastic box with one of those big desiccants for rooms.
That's what I use for my Nylon and PVA from Ultimaker and it works like a charm. It keeps humidity at about 25% inside the plastic box, and I even managed to save a roll of PVA by letting rest in a box with one of these for a couple weeks.