In what sense are protist primitive & in what sense are they advanced? You can only upload files of type PNG, JPG or JPEG. 2  You can only upload files of type 3GP, 3GPP, MP4, MOV, AVI, MPG, MPEG or RM. 3  You can only upload photos smaller than 5 MB. 4  You can only upload videos smaller than 600 MB. 5  You can only upload a photo (png, jpg, jpeg) or video (3gp, 3gpp, mp4, mov, avi, mpg, mpeg, rm).
In answer to your question, you can use a Forever stamp, but it won't be enough on its own. The cost of a US Forever stamp is 49 cents, while the cost of a letter to Canada is $1.20. USPS also sells a Global Forever stamp, as others have noted. You can certainly slap one of those on a letter to Canada.
The price of postage for a one-ounce ordinary size non-rigid first class letter to Canada is 75 cents. The USPS online Postage Price Calculator for Domestic and International Retail Prices is at the Related Link. The price of postage for a one-ounce ordinary size non-rigid first class letter to Canada is 75 cents. First-Class MailÂ® International Letter. Maximum Value for Contents: $400.00. Max. length 11-1/2, height 6-1/8 or thickness 1/4.