This is a Spice packet (/sachet) organizer with a convenient side opening. This opening allows easier access, especially when storing the packets up high or in tight cabinets.

The individual compartments are sized 12cm deep, 3cm wide and 9cm high.

You can find a smaller version, suitable for smaller packets here: https://www.printables.com/model/997460-kitchen-packet-organizer-with-side-access