The stickers are great, but a tip for you would be to update your packaging!
The stickers thrown in the USPS priority mailer without any kind of protective seal and made me a little nervous when I opened it and stickers flew everywhere!
I am also an Etsy seller and purchase cellophane 8.5x11 bags on Amazon for like $5 for 100 of them! It would be a great way to ensure you are keeping your items safe and avoid any damage that could potentially be caused through the mail system.
Thanks so much!