What do you all think of "all in one invites" Kind of like: https://www.minted.com/product/all-in-one-wedding-invitations/MIN-Y5T-AIO/vines-of-green? &quantity=25&shape=default&utm_medium=sem&utm_source=google&utm_sub=pla&utm_campaign=G_S_Wedding_WeddingInvitations_PLA_USA_Alpha&utm_content=&utm_cs=455884&utm_int=a&utm_keyword=&utm_device=a&gclid=Cj0KCQiA7dHSBRDEARIsAJhAHwhh-8mw207shdQHpeGRaxHiqqI6U-vLec0bf6GiGtt_HbNLLhy6UOEaAhE_EALw_wcBI think it is a great way to save money and not waste paper--but my MIL thinks it looks cheap.
I used very similar invitations and they were fantastic! I personally dislike receiving invitations with multiple envelopes and cards - it's annoying to keep track of and generally really wasteful. I did have a few postcards not make it back, but it was not a big deal at all. Just had to follow up with them after our RSVP date.
Also - I've received this style invite before and at least half the time people forget to stamp the return postcard. Don't forget to do that!!! Bonus, postcard stamps are cheaper than regular stamps.