I ordered my invitations last week. I ordered invitations, invitation envelopes and RSVP cards. We are not offering the option to mail the RSVP cards back, so instead we provided a phone number and a email address to respond. Since we weren't wanting anyone to mail back the RSVP cards, we did not buy RSVP envelopes. Is it ok to just place the invitation and the RSVP card in the same envelope verses the RSVP card being in a smaller envelope?