A cassette for dispensing elongated tubing and for use with an apparatus comprising a bin defining an enclosure with an opening defined at a top thereof for receiving at least one disposable object to be packed, a holder within the bin proximate the opening, and a closing mechanism located below the holder comprising a first portion and a second portion, the second portion being biased in a closed position against the first portion and defining a receiving surface for receiving the at least one disposable object, the second portion being slidable from the closed position to an open position through application of a substantially vertical force against the receiving surface and being slidable from the open position to the closed position under the action of biasing means, the closing mechanism in the open position defining a passage between the opening of the bin and a bottom portion of the enclosure located below the closing mechanism, the closing mechanism in the closed position closing the passage; the cassette comprising: an annular receptacle accommodating a length of tubing in an accumulated condition; an annular opening at an upper end of the annular receptacle for dispensing the tubing, wherein the annular receptacle defines a central opening through which a knotted end of the tubing may pass to form a bag supported by the annular receptacle with disposable objects passing through the central opening to be received in the bag, and wherein the cassette is configured to be supported by the holder in the opening of the bin; and the cassette being characterised by a chamfer in a bottom portion of the central opening, so as not to impede the motion of the closing mechanism from the closed position to the open position. a bin defining an enclosure with an opening defined at a top thereof for receiving at least one disposable object to be packed, a holder within the bin proximate the opening, and a closing mechanism located below the holder comprising a first portion and a second portion, the second portion being biased in a closed position against the first portion and defining a receiving surface for receiving the at least one disposable object, the second portion being slidable from the closed position to an open position through application of a substantially vertical force against the receiving surface and being slidable from the open position to the closed position under the action of biasing means, the closing mechanism in the open position defining a passage between the opening of the bin and a bottom portion of the enclosure located below the closing mechanism, the closing mechanism in the closed position closing the passage; the cassette comprising: an annular receptacle accommodating a length of tubing in an accumulated condition; an annular opening at an upper end of the annular receptacle for dispensing the tubing, wherein the annular receptacle defines a central opening through which a knotted end of the tubing may pass to form a bag supported by the annular receptacle with disposable objects passing through the central opening to be received in the bag, and wherein the cassette is configured to be supported by the holder in the opening of the bin; and the cassette being characterised by a chamfer in a bottom portion of the central opening, so as not to impede the motion of the closing mechanism from the closed position to the open position. an annular receptacle accommodating a length of tubing in an accumulated condition; an annular opening at an upper end of the annular receptacle for dispensing the tubing, wherein the annular receptacle defines a central opening through which a knotted end of the tubing may pass to form a bag supported by the annular receptacle with disposable objects passing through the central opening to be received in the bag, and wherein the cassette is configured to be supported by the holder in the opening of the bin; and the cassette being characterised by a chamfer in a bottom portion of the central opening, so as not to impede the motion of the closing mechanism from the closed position to the open position.