If you follow Kykeon's instructions, the pack should weigh less than a half ounce, mine did. I didn't have a paper envelope to put the sample into which I think is just to be a non transparent layer, so I used a lil newspaper. Anything to block what the see through bags should suffice. Which requires just one international forever (IF). But if you're mailing up to 1 oz: a customs declaration form is also required, and two IF stamps. I was going to include the form and use a fake address name but without the form I'm not commiting forgery on a customs form.