| 摘要 |
A container of the type having a mouth defined by superposed portions of a flexible sheet which can be opened wide and closed by flattening together and convoluting marginal ends of the superposed sheet portions includes a first fastening strip secured to an outside surface of one sheet portion and spaced from the endmost edge of the flexible sheet a length sufficient to define therebetween a marginal portion which may be folded into a plurality of convolutions and the outwardly facing surface of the first fastening strip defines a plurality of upstanding hooking elements of flexible resilient material; a second fastening strip secured to an outside surface of the other sheet portion includes two longitudinal portions the first of which is secured to the flexible sheet and the second of which has an inwardly facing surface defining a plurality of complementary hooking elements of flexible resilient material, the second fastening strip being spaced from the first fastening strip in a direction away from the endmost edge of the flexible sheet.
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