the disk tight closing means 28 may consist of diffusers connected with a varnish glue or similar source 23 a heating system may also be provided to melt the external surface of the disks 23 in order to close the pores in using the apparatus shown in fig1 a bag 24 to be filled with dusty flowable materials 25 is secured to the mouth 26 of a bag filling machine 27 the bag 24 is provided with porous disks 22 in lower sidewalls thereof against which are applied suction disks 21 thereby linking the vacuum pump 20 to the interior of the bag 24 during the filling process when dusty materials 25 enter the bag 24 vacuum pump 20 is energized to suck or draw out the air mixed with the dusty materials from the bag 24 via the disks 22 which tends to act as filters whereby to separate and remove the dusty materials from the air which is drawn out of the bag sufficient suction may be produced by the vacuum pump 20 to produce a partial vacuum within the bag 24 thereby producing vacuum packing of the material 25 within the bag 24 upon completion of the filling process the disks 22 are hermetically sealed by spraying via diffusers 28 a varnish glue or the like thereto alternately the disks 22 may be provided with a meltable surface which seals upon the application of heat thereto in order to permit heat sealing of the pores in the disks 22 also a label or the like.