The AV Stumpfl SK21 roll-up transport box is designed for transporting and storing roll-up screen fabric with a maximum fabric width of 400 cm. The product is identified by manufacturer article number BRV-SK21/400 and has a gross and net weight of 66 kg. The manufacturer lists internal dimensions of 260 × 330 × 450, without specifying the measurement unit in the source data. It is an accessory transport case and not a projection screen.