Minn. Stat. § 203B.21
Subd. 1. Form.
Absentee ballots under sections 203B.16 to 203B.27 shall conform to the requirements of the Minnesota election law, except that modifications in the size or form of ballots or envelopes may be made if necessary to satisfy the requirements of the United States postal service.
Subd. 2. Mailing of ballots; return.
Ballots and instructions for marking them, ballot envelopes, and return envelopes shall be sent by first class mail to addresses within the continental United States and by air mail to addresses outside the continental United States. The ballot envelope and return envelope shall be marked "Official Ballot," and shall contain sufficient postage to assure proper return delivery. The return envelope shall be addressed to comply with any method for return of absentee ballots as authorized under section 203B.08, subdivision 2.
Subd. 3. Back of return envelope.
On the back of the return envelope an affidavit form shall appear with space for:
Subd. 4. Names on envelopes, instructions.
No envelope, return envelope, or instruction to voters shall contain the name of an individual who appears as a candidate on any enclosed ballot.