I needed a bag to store a grating in that would degrade if left exposed to oxygen. I stuck a nitrogen supply hose into the top of the bag and quickly sealed the bag after it was filled. That was about a month ago and the bag is still completely filled with nitrogen. In other words, they aren't kidding when they say this bag is airtight. In comparison, an ordinary ziplock freezer bag will not stay full of nitrogen for more than half a week.
