I had been in business for several years at Patterson Printing in Bridgeview, IL. and we've printed numerous standard #10 and #9 envelopes for businesses. We print them very often, actually. One day I was approached by a local church who was requesting we print tithing envelopes. It sounded challenging, and I thought that since it was for a church it would require more than what is involved for regular business envelopes that we print. Since they are for folks to put cash and checks in them, I had all of these thoughts running through my head about whether they needed to be a security envelope or if they needed a special seal. Low and behold, there is nothing more special about printing tithing envelopes then printing any other type of envelope. They are most often 6 3/4" sized envelopes, which is just a smaller envelope. On a rare occasion we'll get a request for a remit envelope, which is a bit more of a challenge to run through a printing press, but all in all, it isn't too complicated. We usually only print 1 color since that is the most affordable, but some churches get fancy and decide to go full-color which is a whole lot more money, but we can do whatever is needed - If you can think it, we can ink it!
Since we have discovered that there was a whole industry we hadn't tapped into before we began to market towards churches, and it has really taken off. Churches go through tithing envelopes quite quickly and it is a great repeat product. Once the design is done it is very rare that a church changes the design. Tithing envelopes are very important to churches since this is main way the collect funds. Without the envelopes, the churches income will drop dramatically. It is common to get a phone call on a Friday afternoon from a church panicking that they no longer have any envelopes and that they are willing to pay whatever rush fee to get them by the end of the day so they have them for church services over the weekend.