PolyMin might be a better name, or they sent something else.
What I got, via Amazon EU S.a.r.L., were no better than ordinary thin dustnin bags, as you could easily see light through them.
They weigh 23grams each, thickness 25micron (1 mil), understood to 1 gauge.
Thus 200 weigh 4.6kg, so with packaging box, consistent with the 5kg quoted.
They had a circumference of 1.45m and depth of 0.82m.
They will be ok for some jobs, but not what I ordered them for.
Rather disappointing quality and somewhat misleading.