Here in the states, they used to be folded in thirds and wrapped in a plain brown wrapper. Then they folded them in half.
Once I visited Bethel (friends in the Magazine dep't) and asked why the change? I was told that "all this time the Postal Service had been making an exception because they were cooperating with Jehovah's work. However, the volume was exploding and they were asked if they could please fold them in a standard measurement to assist the USPS in distribution of Jehovah's word."
Of course I bought into that shit lock, stock and barrel. Later in life I realized it was more than likely so they could meet some inane Postal Service Regulation for non-profit Bulk Mailings (cheap!) LOL.
Lisa
Media Mail should be reserved for worthwhile publications Class