Abstract: A resilient fastener or zipper, which may be incorporated as part of a bag, pouch, wrapper or liner, or which may be used as a protective garment closure, includes a pair of flexible closure strips and at least one zipper slider. The strips include interlocking ribs and channels of complementary cross-sectional shape which lock together in an interference fit. The ribs have enlarged heads, and, complementarily, the channels have enlarged bottoms. The strips also include webs to which sheet material or the like may be attached and, between the webs and the interlocking ribs and channels, an anti-derailing rib. The latter ensures that the zipper slider remains on track and does not derail from the interlocking ribs and channels when the slider is moved therealong to open or to close the zipper.

Abstract: Polythene bags are used to group together articles of clothing for transit. The invention relates to a security seal for use with such bags to prevent undetected transit theft. The seal according to the invention has two strip-like portions, which are formed with latching portions at points along the lengths of the strip-like portions. The seal is applied to the neck of the polythene bag, and during application the latching portions pierce the bag and pass through to engage in pairs with latching portions on the other strip-like portion. The latching portions have a weakened section, which breaks if the latching portions are urged out of engagement, thus a bag once sealed cannot be opened undamaged, as the seal will have broken latching portions indicating to a checker at the destination that the bag has been interfered with.