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Three punched pockets. A punched pocket (UK English), plastic wallet (UK English), poly pocket (UK English), slippery fish (Sussex, England), sheet protector (US English), plastic sleeves (AU English), or sometimes perforated document bag, is a flat, slit plastic bag with a perforated edge used to hold paper documents.
Two opposing transparent halves are hinged together to form the casing, the back half holding a media tray that grips the disc by its hole. All three parts are made of injection-moulded polystyrene. Around 1993 there was a general shift to the rear jewel case being made of clear plastic instead of black or coloured.
A wide variety of protective devices have been developed following the introduction of collectible card games, including the bulky "top-loader", a rigid plastic case with one open end (essentially a box for a single card) and the less-expensive simple "card sleeve", a card-sized envelope of clear plastic, with one end open.
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Shrink wrap is applied over or around the intended item, often by automated equipment. It is then heated by a heat gun or sent through a shrink tunnel or oven for shrinking. Shrink wrap can be supplied in several forms. Flat rollstock can be wrapped around a product, often with heat sealing to tack the film together.
Many products have been available for the storage of vinyl albums, often clear plastic sleeves. The surface of a vinyl record is readily damaged, so aside from the outer paperboard sleeve, there is usually an inner protective cover to protect against dust and handling. This is normally shaped to allow it to readily slide within the outer cover.
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