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To make an easy paper box, fold a sheet of paper vertically in half, creasing the fold well. Fold each side of the paper to the center crease and unfold it. Then, fold the entire paper in half lengthwise and unfold it again. Next, fold each short side to the center crease, but don't unfold the paper this time. Fold each corner to form triangles, then fold the flaps from the middle down over the triangles. Pull up on the two flaps in the middle, then decorate the box however you'd like!
Video: How to Make an Easy Paper Box - wikiHow