I needed a funnel for filling my silica boxes for the IKEA Samla 22l containers:
ReUpload of Silica Gel Container for IKEA Samla 22l Remixed by Habitaritus - MakerWorld

The problem with the gel containers is that they can keep a huge amount (about 250g) of silica each which is way more than needed to keep the 22l SAMLA box at about 10% humidity.

This funnel sits snug and handsfree on top of the container and can be moved from side to side. I usually start at the corner with the biggest chamber and fill it up like in pic 1. I then move it to the side to empty the rest into the empty chambers (pic 2). After putting the lid back on the gel distributes evenly after a little shake.