It is recommended that a sample of a completed invitation with all of its enclosures be brought to the post office for a clerk to actually weigh. Please note: The weight of an invitation is not the only variable that determines the postage due on your invitations. The overall dimensions of the outer envelope, although within standard weight requirements, may require additional postage. For example all square invitations mailed in the USA, regardless of weight, will require extra postage. So, it is always suggested to let the post office see the invitation ensemble before affixing postage. This will also give you the opportunity to choose custom stamps appropriate for your taste. Samples of our Teal & Turquoise Invitation Kit can be purchased on the product page under the sample tab.