To move altogether four wall faces of the funnel shaped bottom part of a grain bag 2 by pulling a string 6 provided on the outer peripheral side of the bottom part of the bag 2.

One wall face 2a of the four wall faces of the bottom part of a grain bag 2 serves as a base front face. Strings 6a, 6b are placed on the outside of wall faces 2b, 2d on the right and left of the front wall face 2a. One end of each of the strings 6a, 6b is tied to a mounting member a provided on ridges 22, 22 on the right and left side edges of the wall face 2a. The other end of the strings 6a, 6b is guided toward the back wall face 2c facing the face 2a, is inserted in rings 70, 70 provided through a mounting member on the ridges 22, 22 on the right and left side edges of the face 2c to be folded back toward the face 2a, and inserted in other rings 71, 71 mounted through the mounting member a on the ridges 22, 22 to hang down.

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