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Trapper Keeper is a brand of loose-leaf binder created by Mead. Popular with students in the United States, Canada and parts of Latin America from the 1970s to the 1990s, it featured sliding plastic rings (instead of standard snap-closed metal binder rings), folders, and pockets to keep schoolwork and papers, and a wrap around flap with a Velcro closure (originally a metal snap closure).
Trapper Keepers usually had a theme, such as a cartoon, television show, or video game. Between 1988 and 1995, "Designer Series" Trapper Keepers featured abstract designs and later computer-generated images.
The Trapper Keeper was invented in the late 70's by E. Bryant Crutchfield, Director of New Ventures at the Mead Corporation.  The binder got its name because it was sold in combination with pocket folders designed by Mead called "Trappers", which differed from other pocket folders in that the pockets' three sides connected with the bottom, outside edge, and top (as opposed to the bottom, outside edge, and spine) of the folders. This design prevented papers from falling out of the Trapper's pockets when it was closed. Trappers were three-hole punched so that they could be put in any 3-ring binder, including a Trapper Keeper. In August 1978, the Trapper Keeper was tested in Wichita, Kansas, and to the surprise of Crutchfield, it completely sold out. 
Three years after the Trapper Keeper was released, the design was tweaked to include a Velcro strap instead of the initial metal buckle. This design change allowed for easier customer use and more efficient manufacturing. 
The Designer Series ran from 1988 to 1995, which introduced "fashionable, funky and sometimes psychedelic designs... The company also made a deal with Lisa Frank... and licensed iconic characters like Garfield and Sonic the Hedgehog." 
In 2007, a new version of Trapper Keeper featured a magnetic closure in place of the Velcro closure, a customizable front cover, and binder dividers instead of Trapper folders.
In 2014, another new version of the Trapper Keeper was released, featuring a metal button closure, as well as a new feature called "Snapper Trappers", which are plastic strips that act as dividers and they can have regular notebooks attached to them in addition to folders and dividers; the Snapper Trappers can be placed or removed without having to open the rings of the binder.
In popular culture
An advanced, futuristic, titular Trapper Keeper played a prominent role in season four, episode twelve of the American animated series South Park. The episode, " Trapper Keeper", played with various science fiction tropes, including allusions to Akira, 2001: A Space Odyssey, and The Terminator.
- McCarthy, Erin. "The History of the Trapper Keeper". Mental Floss. Retrieved 2018-07-09.
- McCarthy, Erin. "The History of the Trapper Keeper". Mental Floss. Retrieved 2018-01-18.
- helloample.com. "Trapper Keeper is Back! — Mead® Trapper Keeper". Trapperkeeper.com. Retrieved 2014-08-24.
- helloample.com. "Way Back When — Mead® Trapper Keeper". Trapperkeeper.com.