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Bolsa plegable caracterizada esencialmente por el hecho de que consta de una lámina dotada en las proximidades de dos lados opuestos de sendas aberturas simétricas que constituyen las asas de la bolsa susceptibles de unirse ;por medio de un dispositivo de cierre apropiado mientras que centralmente la lámina presenta una zona ocupada por hileras concéntricas de cortes defasados que permiten el estirado de la lámina en un sentido normal respecto al plano de la misma.