Impeccable on all counts.

I read here and there concerns waterproofing and 5 bags I have not used one did not pumped up even a little bit in 15 days time!
Then of course we must pay attention to some points: no hair, no fibers fluff, no dirt of any kind either in the double zipper, or in the suction valve. No tissue stuck at the blue band of the bag.
I also read the cares of strength ... again I question the use of the bags? For my part, at least one was stuffed to the brim by pushing too large duvet as a brute and he did not flinch. Of course one should not rub against concrete or attempt to vacuum pins, but it is a matter of common sense.

Anyway, these bags perfectly fulfill their role, will not reinflate (well, at least not in 15 days time), are strong, and I have trouble understanding the complaining (perhaps a defect on a small series of bags?).

A buy eyes closed if, like me, you have duvets, pillows, ski wear taking a crazy place!

[Edit] over 4 months later, the first bags are always under vacuum, which confirms my first impression!
I use these bags to carry a pillow wherever I go (space savings in the suitcase), and he too has no signs of fatigue.