Triplast 20 x A4 C4 Manilla Hard Board Back Envelopes (324 x 229mm) - Cardboard Backed Please Do Not Bend Envelope with Peel & Seal Strip - Perfect for Mailing, Posting &
Prepaid Envelope Large (C4) up to 500g – 10 Pack - Prepaid Envelopes
Regular letters - Australia Post
Australia Post MyPost Business Flat Rate Satchel Medium – 10 Pack | eBay