As of now, for up to one ounce, postage for rectangular envelopes is $0.49 and $0.70 for square envelopes. An ounce usually consists of one card or invitation and an RSVP or one booklet card with a RSVP. If you include more than that in your envelope, you may need to purchase more postage. For up-to-date postage pricing, please visit Postcalc.usps.com.

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