Zip-Zag Bags are a re-sealable plastic bag made using a specialised plastic and patented 'Dual Lock' zipper system. The result is a durable, re-sealable and reliable storage bag. These bags have an oxygen transfer rate that is 400 times lower than the leading brand. Zip-Zag Brand Bags are the only re-sealable plastic bags that work at a molecular level to guarantee freshness and aromas that stay safely locked inside.