Another option is to use a "Monarch" size envelope 9 x 3 3/4. It gives you more space for large stamps, multiples or large cancels, and your cachet. They are easier to store than a #10 and they fit inside a #10 for shipping. You can also get more ideas from the AFDC society.
Just received my Mark Twain pictorial postmark from Hartford, CT today and it's a good thing I didn't plan to create a cachet on the envelopes first, as there is no room for one with the size of the pictorial postmark being used:
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