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Recipiente tubular que es caracteriza por estar construido de un material termoplástico elástico y flexible, estando cerrado por cada extremidad por solo una porción final que se halla aplastada, de tal manera que se se forman dos paredes planas juntas, pudiendo estar soldadas las de un extremo y sin soldar las del otro extremo, el cual puede abrirse por presión ejercida sobre los bordes laterales opuestos de sus paredes y al cesar la presión recupera su posición de cierre o aplastada con paredes juntas.