Large legal sized envelope, customarily of a orange-y yellow tan color (manila colored) usually for sending legal documents back and forth. Often has a nifty string tie thingy or sometimes a fragile metal closure which is designed to break after one use.

They make them with the metal closures now because the conspiracy of manila envelope makers want you buy more. The old nifty string closure manila envelope companies went out of business because people would buy one manila envelope and use it for the rest of their natural lives.

Waste is profit. Down with the man!