Made to work in tandem with DarkHorseDesign’s Pro Filament Storage System, although I do use Dän's Spool Desiccant Holder that has better airflow. I wanted a way to keep more desiccant in the boxes without interfering with the spools, so I designed a bin for the top of the often-used 4L cereal boxes (The ones I use, and that will definitely work with this model, can be found here: https://amzn.to/4gq2C4k). Your mileage may vary with other boxes.