Fold the other top flap backward, so that there is a flat top to the cup.  Open it up by sticking your finger between the top flaps.

The remaining flap on the top should be folded behind the model.  Put your finger between those two flaps and push on the edges of the model.  The cup will take shape.

The completed cup, ready to hold liquids.  If you flatten the bottom, you might be able to get it to stand up.

The finished model holds water, dirt, seeds, sand, or anything else that might slip through your fingers.  With a little work you can make them square and flat on the bottom, which will help them to stand up on their own.

Fold one (not both) of the top flaps down toward you.

There is a triangle on the top of the model with two flaps.  The cup will be the area between the two flaps.  Take the top flap and fold it towards you.

Slide that flap into the pocket created by the second corner you folder over.

Take that flap, and slide it into the pocket created in the previous step.

Fold a bottom corner to meet the center of the opposite edge.

Take one of the lower edges, and fold it across the model to the opposite side, halfway between the other corners.  It should create a horizontal line on the top edge.

Fold the other corner in the same fashion, so that the corner meets with the corner that was created in the last fold.

Do the same process with the other lower corner, meeting up the top edges of this and the last fold.  The corner should meet the corner that was created in the last step.  Notice that there is a little pocket created in this fold, along the top edge.

Truly functional art!  By far the most handy origami model I ever learned.  Six easy to remember folds, and it really holds liquids.

The most handy origami model I ever learned was the cup. Truly functional art. It involves 6 simple folds, and it can hold liquids. I wouldn't recommend anything hot, and make sure your paper won't absorb the liquid to quickly. If nothing else, it makes a great shotglass.

Fold the paper in half diagonally to create a triangle.

Begin with a square piece of paper, and fold in half diagonally. This should create a triangle. If it doesn't, try harder.