Haha chill bro, not bashing.
What I think xmad and myself are saying or at least myself, is plastic is permiable to air even if air tight. Plastic itself breathes. So yes it will hold water, but air will infiltrate through the plastic itself.
Think of a balloon that eventually deflates, it's not leaking through a hole but the latex itself.
Something to do with the molecular makeup of glass and metal, more tightly packed, or not as reactive(more stable)
I'm talking out my ass now, not my area of expertise. But I do know hydroscopic subtsances are best stored in glass or metal.
Hope this helps. No one wants to see wasted raws!
D10