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Selecting an Envelope Size

Type Name Recommended Max Enclosure Size When Folded Common Uses
  Varies according to thickness  
Business    
 #9 3.75" x 8.625" When folded Return envelopes to be inserted into a # 10
 #10 4" x 9.25" When folded Most common business and coresponce letter mail
 #10 Window 4" x 9.25" When folded Return envelopes to be inserted into a # 11
    
Announcement    
 A2 4.25" x 5.5" When folded Small flat or folded Invite, Thank You, General or RSVP cards.
 A6 4.625" x 6.26 When folded Small flat or folded Invite, Thank You, General or RSVP cards.
 A7 5.125" x 7" When folded Flat or folded Greeting, Thank You or General cards, as well as outer envelopes for A2 and A6 cards and envelopes.
    
Booklet & Catalog    
 6 x 9 5.75" x 8.75" When folded Small booklets, promotional, larger flat or folded thicker items
 9 x 12 8.75" x 11.5" When folded Small booklets, promotional, larger flat or folded thicker items
 10 x 13 9.75" x 12.5" When folded Small booklets, promotional, larger flat or folded thicker items