A keep case or poly-box is a type of packaging, most commonly used with
DVD
The DVD (common abbreviation for Digital Video Disc or Digital Versatile Disc) is a digital optical disc data storage format. It was invented and developed in 1995 and first released on November 1, 1996, in Japan. The medium can store any kin ...
s and
Blu-ray
The Blu-ray Disc (BD), often known simply as Blu-ray, is a digital optical disc data storage format. It was invented and developed in 2005 and released on June 20, 2006 worldwide. It is designed to supersede the DVD format, and capable of sto ...
videos (and sometimes
CDs
The compact disc (CD) is a digital optical disc data storage format that was co-developed by Philips and Sony to store and play digital audio recordings. In August 1982, the first compact disc was manufactured. It was then released in Octo ...
).
Besides
DVD-Video
DVD-Video is a consumer video format used to store digital video on DVD discs. DVD-Video was the dominant consumer home video format in Asia, North America, Europe, and Australia in the 2000s until it was supplanted by the high-definition Blu-r ...
films, keep cases are very common with most disc-based video games since the
PlayStation 2
The PlayStation 2 (PS2) is a home video game console developed and marketed by Sony Computer Entertainment. It was first released in Japan on 4 March 2000, in North America on 26 October 2000, in Europe on 24 November 2000, and in Australia on 3 ...
, and they are also found on many
PC titles and
MP3
MP3 (formally MPEG-1 Audio Layer III or MPEG-2 Audio Layer III) is a coding format for digital audio developed largely by the Fraunhofer Society in Germany, with support from other digital scientists in the United States and elsewhere. Origin ...
-CD
audiobook
An audiobook (or a talking book) is a recording of a book or other work being read out loud. A reading of the complete text is described as "unabridged", while readings of shorter versions are abridgements.
Spoken audio has been available in sc ...
s (all use discs that are the same basic dimensions as a DVD).
Products using keep cases
The first products to be released in keep cases were
VHS tapes, though most were stored in less expensive
pressboard Pressboard is a class of cellulose-based material constructed of several layers (plies) of paper which, when compressed using a combination of heat and pressure, form a stiff, dense material in a range of weights. Pressboard has been widely used in ...
sleeves. In the days before video games were released on
optical
Optics is the branch of physics that studies the behaviour and properties of light, including its interactions with matter and the construction of instruments that use or detect it. Optics usually describes the behaviour of visible, ultraviole ...
media, cartridges would rarely come packaged in specially designed plastic keep cases with lugs inside to hold the instruction manual, as opposed to pressboard boxes. Cartridges and cards for the
Sega Master System
The is an 8-bit
third-generation home video game console manufactured by Sega. It was originally a remodeled export version of the Sega Mark III, the third iteration of the SG-1000 series of consoles, which was released in Japan in 1985 and ...
platform were the first video games to be packaged in any kind of keep case. The vast majority of
Sega Genesis/Mega Drive
The Sega Genesis, known as the outside North America, is a 16-bit fourth generation home video game console developed and sold by Sega. It was Sega's third console and the successor to the Master System. Sega released it in 1988 in Japan a ...
games would come in a plastic keep case (roughly the size of a VHS case), but they were later packaged in pressboard boxes as a cost-cutting measure. Before the standard and commonly used DVD case was invented, early CD-ROM-based video games such as
Sega CD
The Sega CD, released as the in most regions outside North America and Brazil, is a CD-ROM accessory for the Sega Genesis produced by Sega as part of the fourth generation of video game consoles. It was released on December 12, 1991, in Japan, ...
and early
PlayStation
is a video gaming brand that consists of five home video game consoles, two handhelds, a media center, and a smartphone, as well as an online service and multiple magazines. The brand is produced by Sony Interactive Entertainment, a divisi ...
titles would often come in a thicker and taller
jewel case
Optical disc packaging is the packaging that accompanies CDs, DVDs, and other formats of optical discs. Most packaging is rigid or semi-rigid and designed to protect the media from scratches and other types of exposure damage.
Jewel case
A ...
. These have been reputed to break very easily. Since the PlayStation 2, most major console-based video game software is packaged in some sort of keep case, including
Nintendo DS
The is a handheld game console produced by Nintendo, released globally across 2004 and 2005. The DS, an initialism for "Developers' System" or "Dual Screen", introduced distinctive new features to handheld games: two LCD screens working in tan ...
cartridge titles and
Sony PSP
The PlayStation Portable (PSP) is a handheld game console developed and marketed by Sony Computer Entertainment. It was first released in Japan on December 12, 2004, in North America on March 24, 2005, and in PAL regions on September 1, 2005, ...
titles.
Structure
Materials and features
The cases are made of soft, clear or colored,
polypropylene
Polypropylene (PP), also known as polypropene, is a thermoplastic polymer used in a wide variety of applications. It is produced via chain-growth polymerization from the monomer propylene.
Polypropylene
belongs to the group of polyolefins and ...
plastic
Plastics are a wide range of synthetic or semi-synthetic materials that use polymers as a main ingredient. Their plasticity makes it possible for plastics to be moulded, extruded or pressed into solid objects of various shapes. This adaptab ...
with a transparent
polyethylene
Polyethylene or polythene (abbreviated PE; IUPAC name polyethene or poly(methylene)) is the most commonly produced plastic. It is a polymer, primarily used for packaging ( plastic bags, plastic films, geomembranes and containers including bo ...
outer jacket, usually with a printed paper sleeve behind it. A variety of colors are produced, including black, white, red and clear. On the inside are sets of clips that may hold a booklet or additional sheets of paper with extra information. The DVD is held into place with a small protrusion (a "hub") which fits into the hole in the DVD. For console games like the
PlayStation 2
The PlayStation 2 (PS2) is a home video game console developed and marketed by Sony Computer Entertainment. It was first released in Japan on 4 March 2000, in North America on 26 October 2000, in Europe on 24 November 2000, and in Australia on 3 ...
and
Nintendo GameCube
The is a home video game console developed and released by Nintendo in Japan on September 14, 2001, in North America on November 18, 2001, and in PAL territories in 2002. It is the successor to the Nintendo 64 (1996), and predecessor of the Wii ...
, an extra protrusion is available for storing memory cards.
Types of hubs
The structural differences between a CD and a DVD have led many manufacturers to study different hub designs for keeping the DVD (or the DVDs, in multi-disc cases) in place: unlike CDs, which are made from one layer of plastic material, DVDs have two layers, which are thinner (so that together they reach the same thickness of a CD) and not bonded all the way to the center. As a result, a DVD hub is weaker than a CD's, and may be damaged if stored in a case which is designed for CDs only.
In addition to "pluck hubs" (which are often a simple evolution over the classical "crown of teeth"), "push-to-release" hubs are very common: in this case the hub is made in such a way that simply pushing on it with a finger compresses its component parts, thus shrinking the space it occupies and releasing the disc center; under normal situations the release cannot occur accidentally and requires someone to push on the hub (this is obviously more difficult to obtain in slim and ultra-slim cases, where in fact pluck hubs may be preferred to push-type ones).
Damage risk
The larger size of the keep case compared to the CD
jewel box Jewel box or Jewel Box may refer to:
* Jewelry box, a container for gemstones
Places or architecture
*Jewel Box (St. Louis), listed on the NRHP in Missouri
* Jewel Boxes, a name for eight banks designed by architect Louis Sullivan
*Jewel Box Pa ...
means that if the disc becomes detached from the center hub, it can move around inside the box, and the playable surface can be scratched by the hub. This can be a problem during shipping.
The center "Pluck-Hubs" are designed to keep a disc in place while shipping, but can be too tight for normal home use. Because of this, the disc can be damaged upon removal due to excess warping. However, the edges of the center hub can be permanently bent in slightly to allow for a looser fit. Discs are then able to slip out easily, ideal for the home shelf.
Physical dimensions
Case
The height and width of a (closed) keep case are fixed at 190mm (7.48 inches) and 135mm (5.315 inches), respectively.
The thickness may vary to accommodate more discs ("multi" case) or to require less shelf space ("slim" or "thin" case). For a typical single-disc case it is 15mm.
A keep case, thus, ''approximates'' the
Video Software Dealers Association
The Entertainment Merchants Association (EMA) is the not-for-profit international trade association dedicated to advancing the interests of the $32 billion home entertainment industry.
The Mission of EMA is to promote, to protect, and to p ...
recommendation that a single-disc
DVD-Video
DVD-Video is a consumer video format used to store digital video on DVD discs. DVD-Video was the dominant consumer home video format in Asia, North America, Europe, and Australia in the 2000s until it was supplanted by the high-definition Blu-r ...
package have the same height as a VHS tape (187 mm) and the same width as a CD jewel case (142 mm). These dimensions are similar to
digest size
Digest size is a magazine size, smaller than a conventional or "journal size" magazine but larger than a standard paperback book, approximately , but can also be and , similar to the size of a DVD case. These sizes have evolved from the printin ...
magazines.
Paper sleeve
![DVDs_in_the_Media_Collection_(14442820600)](https://upload.wikimedia.org/wikipedia/commons/2/26/DVDs_in_the_Media_Collection_%2814442820600%29.jpg)
The printed paper sleeve for a standard DVD case can be printed on a standard A4 sheet of paper which, after cropping, can be slipped into the outer jacket. The paper room on the front and back panels of the case is 129.5mm × 183mm and spine panels have a width of 14mm or less. This gives 273mm × 183mm as resulting maximum overall dimensions for the printout (which is less than the 297mm × 210mm of an A4 paper sheet).
Inserts
Booklet inserts or leaflet material, when folded closed, should measure to a maximum of 120mm × 180mm. This usually includes a
digital copy
A digital copy is a commercially distributed computer file containing a media product such as a film or music album. The term contrasts this computer file with the physical copy (typically a DVD, Blu-ray, Blu-ray 3D, or Ultra HD Blu-ray disc) with ...
code for a
digital locker
A digital locker or cyberlocker is an online file or digital media storage service. Files stored include music, videos, movies, games and other media. The term was used by Microsoft as a part of its Windows Marketplace in 2004. By storing files ...
service or a
downloadable content
Downloadable content (DLC) is additional content created for an already released video game, distributed through the Internet by the game's publisher. It can either be added for no extra cost or it can be a form of video game monetization, enablin ...
code, if included.
Similar, though not identical, packaging is used for commercial
Blu-ray Disc
The Blu-ray Disc (BD), often known simply as Blu-ray, is a Digital media, digital optical disc data storage format. It was invented and developed in 2005 and released on June 20, 2006 worldwide. It is designed to supersede the DVD format, and c ...
titles and was used for
HD DVD
HD DVD (short for High Definition Digital Versatile Disc) is an obsolete high-density optical disc format for storing data and playback of high-definition video. Supported principally by Toshiba, HD DVD was envisioned to be the successor to th ...
titles. However, the dimensions of the cases are somewhat different, about 19 mm shorter. The individual cases are color-coded, with blue being used for Blu-ray and red for HD DVD, and the format displayed prominently on a stripe above the
cover art
Cover art is a type of artwork presented as an illustration or photograph on the outside of a published product such as a book (often on a dust jacket), magazine, newspaper ( tabloid), comic book, video game (box art), music album (album art), ...
.
Empty cases and do-it-yourself
In addition to the industrial usages reported above, empty keep cases are available at retail stores, which can serve for instance as a replacement for broken cases or for DVDs containing personal video recordings or data. Common brands are
Maxell
, commonly known as Maxell, is a Japanese company that manufactures consumer electronics.
The company's name is a contraction of "Maximum capacity dry cell". Its main products are batteries, wireless charging products, storage devices, LCD/laser ...
,
Memorex
Memorex Corp. began as a computer tape producer and expanded to become both a consumer media supplier and a major IBM plug compatible peripheral supplier. It was broken up and ceased to exist after 1996 other than as a consumer electronics bran ...
,
TDK
is a Japanese multinational electronics corporation that manufactures electronic components and recording and data-storage media. Its motto is "Contribute to culture and industry through creativity".
"TDK" is an initialism of the original Ja ...
,
Verbatim
Verbatim means word for word.
Verbatim may also refer to:
* Verbatim (brand), a brand of storage media and flash memory
* Verbatim (horse), an American racehorse
* ''Verbatim'' (magazine), edited by Erin McKean
* Verbatim theatre
Documentary the ...
,
NexPak,
US Digital Media
The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territori ...
and Amaray. Some vendors, e.g. TDK and Infiniti, also sell recordable DVDs individually packed in keep cases.
See also
*
Optical disc packaging
Optical disc packaging is the packaging that accompanies CDs, DVDs, and other formats of optical discs. Most packaging is rigid or semi-rigid and designed to protect the media from scratches and other types of exposure damage.
Jewel case
A ...
References
{{DEFAULTSORT:Keep Case
DVD
Packaging
Compact disc