These are the center inserts for a drybox that I made to store filament. Using the IRIS 62 Qt. WeatherPro Storage Box, I can fit four desiccant holders (also uploaded to my profile) 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.