I buy laundry detergent in 9 kg bags from a local manufacturer. I solved the problem of keeping it dry and dispensing it from these bags using a 3D printer. The internal design of the funnel took several attempts to ensure that no detergent would stick to the edges and clump over time. The outlet on the side was also necessary because my silo is on a shelf. The outlet is a pinch valve from a beekeeping operation. This is usually used to fill jars of honey. To save filament, I designed the other part of the funnel so that a barrel with the bottom cut out can be glued on. You can find the parts I purchased under the links.
Ignore the yellow plug in the blue barrel; that was the first attempt. The color change is due to the fact that the first print aborted. I didn't want to start the print from the beginning, so I only printed the missing part and glued the two parts together.

https://www.plasteelaste.de/30-liter-deckelfass-mostfass-46-cm-hoch-made-in-germany-guenstig-online-kaufen

https://www.ebay.de/itm/256219012787?_skw=quetschhahn&itmmeta=01JZZ5VCX0YXGVTTH7B3NMGWBA&hash=item3ba7d7deb3:g:QroAAOSwgjxlAx4T&itmprp=enc%3AAQAKAAAA8FkggFvd1GGDu0w3yXCmi1d68oHLtndwKqT9gwx0upDIwfRx5uhvdSDfArYSd%2B9iQANFa3sT5W92l%2FIrOId0O9xDhe7dTbuppVSJxsFvwETZPVX2xxSh2qP4hBPTX1Ah%2FT0Wbab38w1ClypqBLMUGXc%2FWxSS%2Fghp%2B%2B%2FIKbNbu0sohUzUtpigZVcXo53I010W0uFgcQGSH0LKBDAD2529m%2BEP%2BcZohTT0L0splIkPjQLUvi0jWIYrIAW710ftj1i7d0jyIFWtjnY4vB4y5oyFvw3usCcy3KUGj8z13TZC8d51ez76rdyCFPQcizez9vPuvQ%3D%3D%7Ctkp%3ABk9SR_DO7eX_ZQ

I've been using the funnel for a year now and I'm finally happy with it. The contest inspired me to upload my design here. If you have any questions, feel free to write to me and share your makes and remixes.