I've found that decks of cards tend to wander, making them hard to find when needed... so I designed a container for them that isn't convenient to carry around, and is large enough to be easy to find. This is designed to hold two standard (2.5" by 3.5") decks of playing cards in their boxes.

I included an .stl (blank) in case you prefer the model without words or want to add words in the slicer yourself. Or want to print a tiny filament painting and glue it on the side. Go wild!