I recommend shipping in a box wider &/or longer than a shoebox so it will NOT fit in a standard mailbox AND WILL be SAFELY delivered to my door. These work best.
Free Priority boxes (you most likely don’t need flat rate) are available at the post office.
Bags tear easily and get stuffed into the mailbox. Boxes with a lot of vacant air space inside get crushed &/or torn.
Wrap your items in plastic of some sort to protect them in case the package gets torn. Err on the side of caution!! I always do.