Card tray w open end

After using my previous card tray design in a game where you frequently place cards on the bottom of the deck, I decided to make a design where you can do that without removing the deck from the tray. The one that was open on all sides proved too fragile, so I've made one that's open on the end and one that's open on the side. I also made the sides a bit thicker because they seemed a little too fragile before. They can be combined to make larger trays, as in the picture.