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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.

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