Sync to the furthest read page. With Amazon's Whispersync technology, you can automatically save and sync your furthest page read, bookmarks, notes, and highlights across all your devices. That means you can start reading a book on one device, and pick up where you left off on another device.
Calculate your postage rate using the international postage price calculator. For a first-class letter to Canada, the first ounce of postage costs 85 cents, a two-ounce letter costs $1.17 and a three-ounce letter costs $1.49, as of the time of publication.
Sure, as long as you've enough postages. A letter same size and weight as a USA addressed letter up to 2oz is $1.15 or 3 forever stamps for Canada. Every where else it's up to 1oz, for 2oz then 5 stamps. Btw it'll be a good idea to write Air Mail and the country's name at the bottom of your envelopes.