The present invention relates to a multiple bag system for fractionating blood, said system comprising a fluid collecting bag (B.00) comprising at least one outlet port； at least first and second sampling bags (B.10, B.12), each comprising at least one inlet port and at least one outlet port； and means for transferring fluid from the fluid collecting bag (B.00) to the sampling bags (B.10, B.12)； wherein the means for transferring fluid comprises an acoustic sorter (AS0). The present invention also relates to a method for fractionating blood into blood products.
