GrainPro SuperGrainbags (SGB) are gas tight (hermetic) storage bags made of lightweight, multi-layered plastic with a proprietary barrier that prevents moisture and air exchange. Grains, seeds, coffee and cocoa beans stored in an Ultra Hermetic are fresher, safer and healthier. Our bags are certified for organic food storage and eliminate the need for fumigants or pesticides making them eco-friendly. They are also reusable. The GrainPro SGBs are liners for standard jute or woven polypropylene bags.