UPDATE:

I have now tagged the hygro holders with the filament names to avoid confusion.

All hygroscopic filaments can now be saved with tags.

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This dry mod is for the Kichly 4l cereal box (oval chute opening, vailable in germany, united kingdom, france, spain, maybe all over europe @mazon (search "kichly 4l", best price @ UK, incl. shipping to GER) and Amazon.com.

The filament stays dry in the airtight container. I have integrated a silica container that can hold 100g silica in the 15mm version.
If 100g arn't enough for you, take the 20mm (~125g) version.

It can also hold very small spools (Ø135-145mm) and standard spools (Ø200mm) with a maximum width of 66mm (BBL filament).

If you want to keep your hygroscopic filaments (ABS/PETG/TPU, etc.) dry throughout, this variant is a very good choice.

These boxes are more cost-effective in the long term than vacuum bags. These leak quickly and you have to buy often new ones. Some of the cheap Chinese bags leak as soon as they are unpacked. In addition, the storage looks nicer and not so messy. In my opinion, single storage is also better, as a large box with many spools always lets in a lot of moisture and is absorbed by filaments that arn't needed. In the single boxes, the humidity is 10-20% with 100g silica.... Anything below 30% is still acceptable in my experience.
Remember that the silica can only maintain the humidity of the filament but not reduce it!

If you use orange silica, you don't necessarily need the hygrometer, but it looks good and you don't always need to check for the changing color.
Useful to know: Dry orange silica with max. 120°C in the oven and white with max. 170°C. Use 110 and 160 respectively and you will have something from your silica for a long time. Never use the microwave, it destroys the silica!

The hygro holder is optional and tilted forwards so that the display is closer to the plastic and easier to read.

The nice thing is, the box can be used again for its original purpose, because no hole must be drilled and nowhere glued.

Note 1: You can print out of the box with this release from me

Note 2: Calibrate your filament before printing (for example: Sunlu/Jayo PLA+ -> K-Factor = 0.025 & Flow Ratio = 0.98)!!!!

Note 3: Easy removal of the minimalistic support

Filling:
Fill the silica into the bottom tray.
Lift the lower part into the box (photo).
Click the hygrometer holder into the lid
Take the hygrometer holder and insert the lid into the box (photo)

Keep it simple!