Blank Envelopes Gift Card Envelope 3.75″ × 2.125″ Gift Card Pouch 3.75″ × 2.125″ A1 / 4Bar 3.75″ × 5.25″ A2 4 3/4″ × 5 7/8″ A6 4.75″ × 6.5″ A7 5 1/4″ x 7 1/4″ A8 8.125″ x 5.5″ #10 Long Flap 4 1/8″ × 9 1/2″ #10 Short Flap 4 1/8″ × 9 1/2″ 6" Square 6″ x 6″ 6.5" Square 6.5″ x 6.5″ Booklet Long Flap 9″ x 12″ Booklet Short Flap 9″ x 12″