This is a desiccant holder for a drybox that I made to store filament. Using the IRIS 62 Qt. WeatherPro Storage Box, I can fit four of these desiccant holders along with some additional storage compartments for additional silica gel beads, reusable filament storage bags, spool adapters for the Bambu Lab AMS and a hydrometer holder with a secret compartment. This allows me to store 10 spools of filament in an environment below 10% RH.