The package (16) comprises a hose-shaped envelope consisting of a flexible material sheet intended to receive a pasty filler product such as a sealing material or the like, sealingly closed at both its ends. The package comprises a rigid and narrowing end member (22) which is arranged at the compressed end of the envelope shaped as a bottle neck and intended to the outlet of the product and presenting at its narrowed end a centred opening, close to the outlet extremity of the envelope. The end member is a cup which is terminated at its enlarged extremity by a cylindrical collar (30) which is rigidly and sealingly fixed to a non compressed segment of the envelope and which is terminated at its narrowed end by a cylindrical threaded nipple (23). The nipple is radially spaced substantially from the bottle neck-shaped part of the envelope and axially from the corresponding extremity of the envelope, thus enabling the free access of a cutting tool at the opening of the envelope extremity.