I have similar experience with the Z pack liner.
I suspected some leakage when the content kept getting a lot of moisture inside, even a very small puddle in the bottom.
After one of my summer AT sections, I put my pack liner in the bathtub and filled it with water to find any leaks. Good grief, there were 10-15 little micro-streams leaking through the pack.
All together, I had used this liner a total of six months. It is now retired, and will try a nyloflume liner.
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