The answer is: The filling!
Externally the bag really makes a good impression and the material reminds me of my waterproof raincoat. At the top is a zipper (only a zipper without further assurance mechanisms), which is intended to secure the interior. That will not necessarily hold in the long run this backup mechanism should be clear. But now to the actual drawback: Contrary to expectations, this is the customer by hand !!! einzufüllende filling in detail not round but shaped much. Specifically, it looks as if just bigger polystyrene plates were chased by a chopper. Since the small pieces so are not around, the beanbag behaves very stubborn and can be shaped only with difficulty. So you can not just put in the bag and the bottom move a bit so you can sit well, but you have to get up and pull handle and push the whole bag. And even then one has in the back a Press and terminals, because the parts inside just not slide past each other, but get caught. Who was ever in a brand bag will be very annoyed here. So there is absolutely little to no movement in the bag is possible and the "square beads" interlock inside, no breeze comes on the back and it is fast on the back (who previously sat relatively warm in only one brand bag, knows this sensation of warmth not).
I might me now considered the original "EPS polystyrene beads" nachzukaufen but 400L would there probably cost around 50. It occurs to me now that the seat bag (30) + original "EPS polystyrene beads" (50), almost as much cost as a brand beanbag (Sitting Bull).
Thus, I would sum up after this experience: "Had I but rather brought an immediate brand bag, damn it."