Ribbed mat for placement on bottom of file cabinet drawer to prevent document slippage

In combination with a filing cabinet having at least one sliding drawer, said sliding drawer having a generally flat bottom floor to support a plurality of edge mounted files in a generally upright position, means to prevent said edge mounted files from collapsing away from said upright position due to the weight and suppleness of the files, said means to prevent collapsing comprising a flexible, foldable mat formed of a soft pliant plastic material having a large coefficient of sliding friction, said mat having a generally flat bottom surface and top surface, said bottom surface arranged to lie flat on said bottom floor such that the entire bottom surface contacts the bottom floor in a skid resistant manner;

• and a plurality of spaced, parallel primary ridges on said mat top surface, the spaces between said ridges forming grooves to receive said edge mounted files.