The dimensions of the bag (see product information) are for little "oversized", but that's quite ok, because we still can thus additionally accommodate the PSU, a sustain pedal and an amplifier cable - these parts of course in separate bags.
The only drawback of the differences in size, is that the keyboards can be poorly secured with the inside retaining Velcro straps / attached. But we are still cut to appropriate dimensions, or the Velcro stitch up when times transports should pending.
A solid impression makes the interior padding, the fully sufficient for household and unproblematic transport routes - but it is not insurance against falls or very massive mechanical attacks. (More pockets with fixed / rigid inserts or appropriate equipment cases are meaningful for the exclusive transport use.)
The outer material (nylon) the keyboard bag is durable and moisture resistant; charge we have been unable to determine. One patch practical outer pocket with Velcro (29 x 31 cm) can manual, notes, cables, etc. record.
The holding or risers are ok for our use - probably for longer transport routes less comfortable (depending on the weight of the keyboard), since they are not padded - but there may be human without much effort "rework".
With a convincing price-performance ratio, this bag offers a Keyboard our optimum protection, we do not want to miss.
