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Saco, caracterizado porque dispone en la parte superior externa de una de las paredes, de una tira de material flexible y resistente tal como plástico, solidarizada a dicha pared, paralela y, preferentemente coincidente con el borde libre de la misma, siendo dicha tira de longitud superior al ancho de la referida pared, de modo que sobresalga por ambos lados de los bordes laterales del saco en una porción dotada, en un lado, de una ranura o abertura longitudinal, y en el otro de dos muescas o estrechamiento enfrentados, uno en cada bordee determinando una cabeza externa destinada a introducirse por la ranura de la porción opuesta.