The AV Stumpfl SK21 is a roll-up transport box designed for screen fabric widths of up to 500 cm. It is identified by article number BRV-SK21/500/H. The transport box has an internal size of 260 × 330 × 550 mm and is manufactured from heat-treated material. It is IPPC-treated and supplied as a single unit. The listed gross and net weight is 81 kg.