Aliexpress is usually the cheapest crap your can buy. 1 mil isn't even good enough for a freezer bag.
You want 3+ mils at minimum.
I think some of my better better hobby bags are 4-5 mil or more.
I use Comicare 2-mil bags for my comics, and those are pretty thin.
I have some 2x thicker bags that I use for my toys collection, and I do store those bags in boxes with some silica packets. The silica is mostly because the bags themselves can trap moisture, which I don't want. Most of the bags are not sealed, but still.
Some of what you're doing is semi-stupid for optical media. But the same techniques are not dumb for other areas.