A dessicant container curved to go directly next to your filament (on the spool) and into a dry bag or box. The container has several curves to make sure there is plenty of airflow between the dessicant and your filament maximizing drying. There is a lot of surface area so all the dessicant in the container will effectively remove moisture from the air (many designs hold a lot of dessicant but don't have much surface area so they are not as effective).
This model also contains a custom fit funnel (for printing in vase mode) and a tight snap-on lid for the container.
3 containers can easily fit around one spool, print as many as you need for the level of drying you require.
NOTE:
In my experience with PLA and PETG, the lid is a tight snap fit immediately after printing. After the lid has been on the container for a day or two, the fit loosens up a bit - but it is still a reliable snap closure even after some filament creep. I wanted to make sure the lid didn't get loose and potentially spill the desiccant beads.
If you want a looser fitting lid, I uploaded one with more clearance here:
https://makerworld.com/en/models/466324#profileId-375297
Let me know if the original lid works well for you, or if you needed the looser fit.
Thanks!