Just a different view here. I sell almost exclusively online. While presentation is important, I also value ecological footprint. (I’m in the wrong business, I know!) I use recycled and recyclable paper padded mailers from EcoEnclose. They also started offering zero waste thermal labels, which I’m excited to try once I run out of my stash of regular ones. My boxes are also recycled and recyclable, currently from Nashville Wraps. I also have them heat stamped there, but I used to hand stamp them all when I had lower volume. I do not print an invoice as all my customers have a digital copy of their receipt. I get recycled paper box inserts custom cut at Uprinting (I snip two notches for necklace chains or small hole punches for earrings. Rings I just slit the fiber fill, or put in a small cotton pouch). I also get recycled business cards where I write a simple personal thank you on the back. I tie my box with blue cotton twine. It all looks nice and there’s no plastic (except probably in the box fiber fill, which is at least supposed to be recycled.)
Padded mailers fit in more mailboxes than boxes do. My mail person will always try to stuff a mailer in the box rather than leave it on the floor to potentially be stolen. Don’t forget that many people live in apartments with teeny mailboxes! Something to keep in mind when dealing with customers who like to say the package never arrived. (If you are primarily shipping fine jewelry via Fed Ex or Malca Amit, it’s less of an issue as someone will have to sign anyway.)
I am not a fan of Uline. Check them out for yourself and decide what you think.