I loved Humebeam's dessicant box design for his AMS Hydra Mod and adapted it for cereal container dry boxes. As with the original I HIGHLY recommend using a M3 socked head bolt from 6-10mm long to pin the lid in place, the dessicant beads go all over the place easily if they get out. No supports needed, bridging should work fine. I printed mine in ABS but anything should work.
The author remixed this model.