The abrasive systainer for the RS2 is a SYS 2. The sheet are stored vertically and not a lot of space is wasted.
There are 6 slots where the sheets can be stored.
I manage to stuff 30 RS2 sheet in a slot so more or less 180 RS2 sheets.
I manage to store 50 sheet of 5" or DTS400 sheet in a slot so more or less 250 sheets per systainer.