A carrier bag comprising a body having a closed base, closed sides and an open mouth opposite the base, handles extending from the open mouth away from the base, an attachment means extending from or separably connected to the handles and arranged separably to connect the handles together and two mounting member receiving formations, one on each side of the bag, arranged respectively to receive a mounting member of a mounting arrangement. A carrier bag comprising a body having a closed base, closed sides and an open mouth opposite the base, handles extending from the open mouth away from the base, an attachment means extending from or separably connected to the handles and arranged separably to connect the handles together, the attachment means comprising a loop of flexible material extending through apertures in the handles. A carrier bag comprising a body having a closed base, closed sides and an open mouth opposite the base, handles extending from the open mouth away from the base, two mounting member receiving formations, one on each side of the bag, arranged respectively to receive a mounting member of a mounting arrangement, the mounting member receiving formations each comprising a cut or an aperture at a point on the body between the mouth and the base and being formed so as not to create an area of weakness in the body that may cause a failure upon filling or carrying.