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Help Center » Frequently Asked Questions » Do you have inner / outer envelope sets?  Do you have inner / outer envelope sets? Solution Some people use our A6/A7 or A8/A9 envelopes as inner/outer. Please note, they are not similar to traditional inner/outer sets as there is a large gap between than the A6/A7 or A8/A9. We would recommend drawing the dimensions on scratch paper and see if that could work for you. Also, all our envelopes are gummed with adhesive on the flap.  Search All Questions Home | Contact Us | Frequently Asked Questions