Isn’t that contradictory?
If you loose vacuum, you are taking in air which will have more moisture than the air inside the bag.
This. According to the hygrometer on my desk, it’s 70% ambient humidity today. If the bags leak and take in air, they’re taking in water with it. At that point permeability is not the main problem I face. 
2 Likes
Even if they would take in 1L of air due to leakage, the amount of water carried in with that air is negligible compared to the water that comes in over months or even weeks through the plastic.
And 1L would be already bulging the bag.
at 25°C, 50% RH, 1L of air contains 0,0115g of water.
my molecular sieve in the bags is saturated after typically 2 months when I don’t open the bags. It can hold roughly 15g of water before it is saturated.
So in those 2 months, more than 1000x the amount of water enters the bags through the plastic compared to the water than 1L of leaked in air would carry.
That is why I care more about permeability of the plastic than about holding a tight vacuum.
1 Like