| 摘要 |
Provided is a double container (1) that can reliably prevent penetration of water via an air introduction hole (15) and avoid an adverse affect caused when water penetrates an intermediate space (21) between an outer shell (11) and an inner bag (12). The double container (1) has the outer shell (11) and the inner bag (12), and the inner bag (12) contracts as a content accommodated in the inner bag (12) decreases. The outer shell (11) has the air introduction hole (15), and has a hydrophobic filter, by which to transmit air and block off water, disposed thereon so as to seal the air introduction hole (15). The hydrophobic filter (F) is, for example, a polypropylene nonwoven fabric or a lamination in which a hydrophobic minute porous film (F1) and a nonwoven fabric (F2) are laminated together. When the polypropylene nonwoven fabric is used, a basis weight is preferably in the range of 160 g/m2 to 250 g/m2. The air introduction hole (15) may be provided with a valve member (5) that regulates entrance and exit of air between an outer space and the intermediate space (21) between the outer shell (11) and the inner bag (12). |
