Abstract: The present invention provides a powder bag. The powder bag having a top and a first mouth at the top includes a bag body configured to have an internal wall, a major space and a secondary space, wherein the major space and the secondary space is partitioned by a partition interface; and the secondary space configured to have a second mouth and a second switch element for opening and closing the second mouth, connected with the internal wall and used for containing a powdery substance, wherein the partition interface has a porous surface with a plurality of pores and each of the plurality of pores having a dimension which allows a part of the powder substance to transfer from the secondary space to the major space.

Abstract: The present invention provides a powder bag. The powder bag having a top and a first mouth at the top includes a bag body configured to have an internal wall, a major space and a secondary space, wherein the major space and the secondary space is partitioned by a partition interface; and the secondary space configured to have a second mouth and a second switch element for opening and closing the second mouth, connected with the internal wall and used for containing a powdery substance, wherein the partition interface has a porous surface with a plurality of pores and each of the plurality of pores having a dimension which allows a part of the powder substance to transfer from the secondary space to the major space.