Air in vacuum-sealed bag phenomenon
This happens to me once in a while:
I would vacuum-seal something (say, cheese, meat, or nuts), stick it in the freezer, then after a month or so, find that there's air in it. I think the seal of the bag is still intact however because:
a) I re-examine all the sealed borders.
b) I am able to re-vacuum-seal the same bag, even by cutting and sealing the factory-sealed side of the bag just to test the integrity of the Foodsaver-sealed side. (My Foodsaver does not seal if it does not achieve a vacuum. So if there was even a pin hole in the bag due to snagging in the freezer or defective seal, the Foodsaver won't seal it and the indicator light does not go on.)
Btw, I only use the prescribed Foodsaver plastic bags.
My question: Can the sealed food possibly be generating gas over time?
Please note that this phenomenon happens only once in a while. Most of the time, my sealed stuff stay intact forever.
'Never eat more than you can lift.' - Miss Piggy