Has anyone made their own postcard RSVP's to go in their invitations? If so, I'm curious to know the paper weight you used as well as the dimensions for mailing purposes? Basically, what does USPS accept? I've gone to their website and I know they give a minimum and maximum size for postcards, but if your postcard size falls somewhere in-between, does it get mailed?
I'm just very confused with this aspect of DIY invitations and I know I'd rather do a postcard over a letter in which I'd have to include an additional envelope.
TIA!