Pre- stacking and sorting, as a supporting process, prepares the fibre bales for warehousing. When storing fibre bales in an automatic or manual warehouse, optimal bale stacking is required to ensure safe handling and minimum space requirements at the storage place. A pre-stacking system with multiple storage locations serves as a buffer and reduces downtime. Pre-stacking enables a quality monitoring of the bale shape and to sort the fibre bales according to colour, fibre length or other product specifications.