>Forgive the stupid question but what is different about an offering envelope? Is it a standard size (albeit smaller than a #10) or is it an off-the-wall size?<

One of the main reasons they are smaller in size is they need to "fit" this little pocket that is found on the back of most pews (church benches). This size has been used for probably 100 years, so I doubt it will ever change, as those pews last forever. Also, they fit nicely in even the smallest Bible.

Mel Cummings