Direct Mail Paper and Invitation Envelope Size

[James Ritter]

Hey guys.

I am going to be sending out 3k letters for my first campaign. Wish me luck on getting at least a few good leads.

Anyway, I have read a few posts suggesting to use invitation envelopes. What size envelope and what size paper? Do I go standard size paper even though invitation letters are smaller and just fold them up? Any advice would be great.