The number of postage stamps required to send mail from Louisiana to Bermuda depends on the type of stamp used, the selected service used for delivery and the dimensions and weight of the item to be mailed. If mailed via First-Class Mail International, a standard letter costs $1.15 in postage as of June 2014. One Global Forever stamp could be used.
Under the U.S. Postal Service guidelines, a letter-sized, flat item that weighs 4 pounds or less and is valued at $400 or less can be mailed to Bermuda from the United States as a First-Class Mail International item. A Global Forever stamp has value equal to the First-Class Mail International single-piece 1-ounce machinable letter price that is in effect when used. A Global Forever stamp can be used to mail a 1-ounce machinable letter-sized piece of mail anywhere in the world. If the item to be mailed weighs more than 1 ounce, then additional postage is required.
If the item to be mailed exceeds 4 pounds, has non-standard dimensions, is valued at more than $400 or requires faster delivery, additional service categories are available through the U.S. Postal Service. Global Express Guaranteed and Priority Mail Express International provide expedited delivery options, and Priority Mail International and First-Class Package International Service are intended for mailing of packages.