This is a Minecraft Chest:
It's for storing a player's inventory (or stash, for us fabric-hoarding crafting people)
We made cardboard ones for the party.
They were very easy - I made 15 in about 3 hours (with lunch in between).
Start with a rectangle that's made of 6 squares. Each square will be one face of the chest. Our chests were 6" x 6" x 6" so our rectangle was 12" x 18".
Cut the rectangle apart like this, into two equal halves.
Score and fold each half along the dividing lines.
Hot-glue edge-to-edge to make a closed cube.
Lightly score a line 1-1/2" from the top face on the fourth adjoining face. The lid will bend along this line as a natural hinge.
Left as is, the box will not close completely, and stay closed. We need to add an inner layer around the open rim for friction. To do this, cut a strip of cardboard (ours was about 1" wide) long enough to go around almost three complete faces. Ours was about 16"-17". Fold it into three sections, making sure it fits snugly along the inner surface of the box.
Hot glue it on the inner surface of the box so that about 1/2" of it protrudes above the cut edge.
Here is our pile of finished boxes.
All their lids stay shut.
The girls and I then painted the edges of our boxes in iconic Minecraft style, and added a fake catch. This was leftover bits of foam board painted silver and glued to the lid.
The catch, in addition to being decorative, provided some grip for lifting and lowering the lid.
Here is the finished Chest,