The XPressPost envelope I got is sold at Canada Post
It looks like this:
https://www.google.ca/search?q=express+post+envelopes++canada&espv=2&biw=1920&bih=971&source=lnms&tbm=isch&sa=X&ei=-ZpeVdKcFYqdNqusgNAH&ved=0CAYQ_AUoAQ#imgrc=p1QCO6k-kPKdoM%253A%3B9veZh1nFT1x46M%3Bhttp%253A%252F%252Fconformer.com%252Fblog%252Fwp-content%252Fuploads%252F2011%252F08%252FIMG_5658-cropped-and-corrected.jpg%3Bhttp%253A%252F%252Fconformer.com%252Fblog%252F2011%252F09%252Fcanada-post-switches-to-conformer%2525C2%2525AE-products-mailers%252F%3B2756%3B2370