I'll also attest to Nathan's and Jo's packaging methods. I learned a valuable lesson decades ago as it pertained to shipping knives. I learned the USPS understood the problem much better than me, the knife novice. I turned in a claim that was immediately denied and I received a warning from the Office of US Postal Inspector.
You really need to know what you're doing if shipping without a sheath. Sure, you can bundle a knife up with all sorts of material after putting a cork on the point, putting the knife into a zipper case and the zipper case surrounded by packing material. But when the shipper throws the box, or the truck stops quickly, the plane applies landing brakes harshly, then the linear momentum of steel will stab right through everything in it's path - the cork, zipper case, packaging material, box, you name it. Postal carriers have been killed by improperly packaged knives that become dangerous projectiles when acted upon by force that increases the linear momentum of the object.
And you are guaranteed that the USPS will never pay an insurance claim for damage to an unsheathed knife. Instead, they're likely to pursue a court action if any postal carrier is even scratched. I've seen LOTS of knives arrive with the tip of the knife sticking out of the package. Sheaths are the only real protection, though a temporary shipping sheath can be fashioned from cardboard for some designs, but must be done expertly, precisely the way Jo does it. Just my two cent rant.