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25" x 6.25" stiff craft felt. Some craft felt is very, very expensive. You'd never think felt would cost a pretty penny, but it can. Skip that aisle and go for the stiffer, cheap version that most craft supply stores have, too. You need it to be stiff anyway. This shape of box has a taller bottom half and a shorter lid, hence the size discrepancy between the two sheets of felt. Of course, you can adjust these dimensions how you see fit. You're holding in your hands two box halves that are ready to go once you glue them together. You can use whatever you have on hand, though hot glue is easiest. Just dab a bit on the center of the tabs, making sure not to squeeze it outward and all over the sides of the box. Let it dry for a few minutes, holding the tabs to the sides of the box. Then place the box top over the base of the box and marvel at your handiwork.
Get one piece of 9" x 9" stiff craft felt and one piece of 6. Glue the tabs to the sides and voila.