Independent laboratory studies have shown that Mapware by Natural Storage Systems will reduce damaging oxygen inside its containers. Use in conjunction with canisters of Natural Preserve to extend shelf life of food, wine and other products.Safe and effective - natural and organic. Also see Zip-N-Zap Bags, Snap-N-Zap Caps and the original Duckit all by Natural Storage Systems. Purchase now at www.NaturalPreserve.com