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That depends, but.... A standard #10 envelope 4.5″ x 9.75″ weighs .238 oz or 6.75 grams. 6.75 * 2 = 13.5 g 0.238 * 2 = 0.476 oz 2 standard envelopes weigh approximately 13.5 grams or 0.476 ounces.
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.
area of envelope = l Xb =8.5 X11 =93.5 inch^2
It does not cost very much in order to ship a standard piece of US mail in a padded envelope. The cost of shipping standard US mail in padded envelopes can cost as little as $3.
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.
about 30grams
100%...
For purposes of renewing a passport by mail, the weight to mail in the two-page renewal form, two passport photos, and the old passport in a standard letter-sized envelope is about 1.5 ounces. If you use a priority mail envelope from the USPS the total mailing wait is 2.6 ounces.
99 cents in a standard envelope.
The cost to mail a 5.75 x 8.75 envelope will depend on the weight of the envelope. As of May 2014, the cost to mail a standard letter is 49 cents.
It depends on how much they weigh. You can check with the carrier how much it will cost once you know how heavy they are.
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.