To wrap something up in a covering is to envelop it (pronounced “enVELLup” ). The specific wrapping you put around a letter is an envelope (pronounced variously, but with the accent on the first syllable).
There is "Embrace Debate," and there is "Embrace Debate And Let Your Hands Roam Southward Until They There is " Embrace Debate ," and there is "Embrace Debate And Let Your Hands Roam Southward Until They Envelop Debate's Buttocks, Kneading Them Roughly, Spanking Them At Irregular Intervals, Stopping Only To Insert Your Entire Fist Into Debate's Anus." This is not the former.
June 18, 2013 - Deadspin
First-class ticket: more legroom, more emissions First-class air passengers have a carbon footprint as much as seven times larger than the average passenger's, according to a new study from the World Bank. The study comes as airliners push the envelop of luxurious accommodations, while simultaneously aiming to 'green' their operations.
June 17, 2013 - The Christian Science Monitor
Envelope Maker Filing for Bankruptcy Protection Frisco based ‘National Envelope’ says it’s filing for bankruptcy protection. The company is the largest private envelope maker in the US. …
June 12, 2013 - Nightcap TV
Envelope Maker Filing for Bankruptcy Protection Frisco based ‘National Envelope’ says it’s filing for bankruptcy protection. The company is the largest private envelope maker in the US. …
June 12, 2013 - Nightcap TV
National Envelope Hopes To Lick Bankruptcy Filing National Envelope, the largest privately-held manufacturer of envelopes in the U.S., has filed for bankruptcy protection. It's a sign of the paperless, digital times. It previously filed for Chapter 11 protection in 2010.
June 11, 2013 - NPR