This is a customized funnel for the desiccant holder I made for filament spool meant to be used in vacuum-sealed bags.

You can find the model of the desiccant holder here: https://makerworld.com/en/models/75376#profileId-79880

The funnel fits snugly to the opening so you can pour in silica gel beads without holding the funnel. You will have to hold the desiccant holder though, at a slight angle so that the beads rolls to the other end.