... , sewn bottom bags, PVSE bags, heat sealed bags, SOS bags, SOM bags, fumed silica bags Multiwall paper bags, kraft paper sacks, sewn bottom bags, PVSE bags, heat sealed bags, SOS bags, SOM bags, fumed ... -52mmStructure: 1-6 layers--Straight tube; T-style with square bottom; M-style with gusset;--No sewing, no pullution, completely sealed and ...