Lettermail template - Official Canada Post Lettermail Sizing Template - shipping Canada - 40cm x 29cm - 1 piece (2220) - Canadian shipping
Official lettermail sizing template from Canada Post - French and English
This is the same template that they use at the post office to check your mail.
The 2 slots let you check if your standard or oversize envelope is too thick to be accepted.
The rectangles drawn on the template are the minimum and maximum sizes for standard and oversize mail
Size: about 39.5cm x 28.7cm, 3.3mm thick
Weight: about 410g
Thank you for looking, please contact me with any questions.