An apparatus for forming waste containing packs from a length of flexible tubing comprising: a housing including a bottom portion, an intermediate portion and a top portion; said top portion displaying an opening to receive waste material therethrough; a cassette mounted in said top portion and containing a package of flexible pleated tubing; said cassette being so constructed as to enable tubing to be dispensed therefrom and downwardly into said intermediate and bottom portions of said housing; said tubing in said bottom portion having a closed end; and a guillotine-type sliding member mounted in said intermediate portion of the housing and adapted to slide between an inward tubing engaging position and an outward retracted position; said sliding member having an outer end extending outside said housing and an inner end extending in said intermediate portion of said housing, the inner end of the sliding member cooperating with the intermediate portion (16, 32) of the housing in the inward tubing engaging position to contactingly squeeze said tubing thereby forming a lower waste receiving tubing compartment and an upper waste receiving tubing compartment; whereby waste material received through said opening and in said upper compartment is dispensed, upon retraction of said sliding member, into said lower compartment and whereby, when said inner end of said sliding member is in said inward tubing engaging position, the waste material in said lower compartment is sealingly enclosed therein, the apparatus being characterized in that it further comprises a locking arrangement (40,42) at the outer end of said sliding member securing the sliding member in the inward tubing engaging position, the locking arrangement being disengageable for allowing sliding of the sliding member from the inward tubing engaging position toward the outward retracted position. a housing including a bottom portion, an intermediate portion and a top portion; said top portion displaying an opening to receive waste material therethrough; a cassette mounted in said top portion and containing a package of flexible pleated tubing; said cassette being so constructed as to enable tubing to be dispensed therefrom and downwardly into said intermediate and bottom portions of said housing; said tubing in said bottom portion having a closed end; and a guillotine-type sliding member mounted in said intermediate portion of the housing and adapted to slide between an inward tubing engaging position and an outward retracted position; said sliding member having an outer end extending outside said housing and an inner end extending in said intermediate portion of said housing, the inner end of the sliding member cooperating with the intermediate portion (16, 32) of the housing in the inward tubing engaging position to contactingly squeeze said tubing thereby forming a lower waste receiving tubing compartment and an upper waste receiving tubing compartment; whereby waste material received through said opening and in said upper compartment is dispensed, upon retraction of said sliding member, into said lower compartment and whereby, when said inner end of said sliding member is in said inward tubing engaging position, the waste material in said lower compartment is sealingly enclosed therein, the apparatus being characterized in that it further comprises a locking arrangement (40,42) at the outer end of said sliding member securing the sliding member in the inward tubing engaging position, the locking arrangement being disengageable for allowing sliding of the sliding member from the inward tubing engaging position toward the outward retracted position.