The Manila envelope (also called manila folder) is a file folder designed to contain documents. It is generally formed by folding a large sheet of stiff card in half. Though traditionally beige, sometimes other colors are used to differentiate categories of files (From: Wikipedia).
The name ‘manila envelope’ originated from manila hemp or abacá, from which manila folders were originally made. Manila, the Philippine capital, is one of the major producers of abaca and used to be the biggest exporter of abaca or Manila hemp during the American colonial period in the first half of the 20th century.
Made of thick, durable paper and sized so that full sheets of paper can fit inside without being folded, the manila folder has a mechanism on the closing flap that allows it to be opened without damaging the envelope so that the envelope can be re-used. Manila envelopes have become iconic that the name is used, as an informal noun (manila) to indicate generic types of envelopes made of brown, unbleached paper, which are popular for being inexpensive and durable.
Mabuhay ang Manila envelope!