The cases are stable and keep 3.5 '' - Fesplatten safely and without rattling in soft foam. The hinge is unfortunately only a simple film hinge - but because the cases are certainly open only every few days I do not expect a rapid wear. Leave blank the cases difficult to open, a screwdriver as a lever offers itself as a tool. If a disk in case it presses against the inside of the lid, helping enough opening that it can be done easily without leverage.
The first delivery was suffering from a strong, chemical smell. The seller has therefore contacted me and sent me a replacement.