This is a remix designed to fit the cereal box spool holder by JRK Prints (https://makerworld.com/en/models/86214#profileId-92100). That holder is designed to hold a desiccant bag, but I wanted to use rechargeable desiccant beads. I did admittedly get a tad lazy in two ways:

1. This is pretty much just a resize to fit the spool holder, but not to precisely fit the exact contours of the box - mostly because I'm a newbie to modeling and wasn't up to tackling the angled edges. Resizing the rectangle was much easier.
2. The original model uses a screw to keep the lid secured. I hate screws in applications like this, so I designed this to not require one - the lid simply stays in place without it. Therefore, I didn't size a screw, although a small enough one should work fine if you feel the need for one.