There are two main forms of record sleeves for LPs: The simple insert jacket, known in the trade as a single sleeve, and a more book-style cover. The latter is usually referred to by collectors as a gatefold cover or fold-out cover (FOC).
While with the simple cover the records are simply pushed into the cardboard sleeve from the side, the gatefold cover can be opened like a book.

A gatefold is actually a fold-out insert, for example in a magazine. The inside part is usually used to create space for additional information such as song lyrics, pictures or artist information.
With the fold-out cover, one part of the sleeve is usually closed, while the record is inserted into the other part of the sleeve in the inner sleeve.
For double and triple albums, the additional flaps serve to accommodate additional long-playing records. When folded, a gatefold cover has approximately the same outer dimensions as the standard covers.
Single sleeves and trifold covers
In contrast, simple slipcovers that cannot be opened are called single sleeve covers. These are sometimes also used for double or triple albums.


In addition to gatefold and single-sleeve covers, there are also album covers that fold out three times, such as Tom Petty’s Wildflowers. In collectors’ circles, this is called a trifold cover.
Boxsets


Another variant of record covers are box sets. Here, the records are in a solid cardboard box with a removable lid. This cover variant is mainly used for extensive album boxes with three or more records, as well as particularly high-quality releases such as the Onestep releases by Mobile Fidelity Sound Lab, Analogue Productions or Impex.
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