The invention relates to a kit of parts comprising a collecting device for collecting a tissue sample and a storage tube for storing the tissue sample therein. The collecting device comprises a punch and a plunger located within a bore of the punch and being adapted to slide within the bore. The storage tube comprises a tube body having an open first end, a closed second end, and a cap located at the first end of the tube body, the cap having a breakable seal that extends across the body of the tube to seal the first end of the tube body. The collecting device is adapted to break the seal of the cap and to fill the resulting opening to close off the storage tube.