Pro tip: Use a fork to make perfect pompoms. I actually tried this and it is works. It's just the part when you tie around the wool, well the wool doesn't go over that tie and it kind of makes it look like a toddler made it
A lady at the post office taught me this trick and I have realized very few people know about it! You can turn a flat rate envelope into a pouch to increase the capacity. It holds more than a small flat rate box ($5.80) and about as much as a medium ($12.35) for only $5.60. So worth it! I do this all the time! Just fold the bottom both ways, and flatten it out from the inside, folding the corners and taping them up into a rectangular bottom. Secure with lots of tape. Happy shipping!