Lantern.
First take a square piece of paper, fold it diagonally twice, then open it and fold it twice horizontally and vertically. Then fold it inward according to the crease to form a square, and then use both sides to fold small triangles inward. Same thing on the back. Then fold the bottom corner upwards, then turn it over, then fold the corners upwards, then turn it over to the other side, fold the corners inward and then upwards.
Then turn it around, fold the top corner flat, and then restore it. Finally stretch it out. A bottle like a lantern is now folded.