The amount of stamps needed for an envelope is determined by weight. Weigh your a4 envelope and you will know how much postage is needed.
The cost to mail a manila envelope will depend on the size of the envelope and the weight of the envelope. The average cost to mail a manila envelope that is 8"X11" is about $2 if the contents weigh less than one pound.
area of envelope = l Xb =8.5 X11 =93.5 inch^2
The same as you would a short envelope.
It would depend on the type of paper as well as the thickness. For example, wood pulp paper would weigh much more than rice paper.
A better question would be who would buy National Envelope.
The front of the envelope would have 1, while the back would have 2.
As long as the envelope doesn't weigh too much (If you're just mailing paper, then it probably doesn't) then no it doesn't cost more.
Postage depends on which country you live in, how much the envelope and contents weigh, and where you are sending the envelope to. You'll need to include all that in your question to get the correct answer - or you could just go to your local postal website and get the answer from the experts...
Not really, though it is possible it might go through. It would fit the definition of irregular shape. It would mess up the mail handling machines and would probably rip the envelope and they would get lost. A padded envelope or small box would be better. Answer Put it in a sturdy envelope or cardboard envelope--or wrap it with a piece of cardboard. Mark the envelope to "hand stamp only." You might wrap the envelope with clear packing tape, too.
I would include an envelope opener with executive desk accessories. I would preferably include a leather chrome or gold finished envelope opener to an executive desk.
You put documents in a folder for storage; a letter would go in an envelope.