You can make a bundle of knives like below and post them in a postal tube, large satchel, or box. A postal tube would only take a bundle of one or two knives. A large satchel, e.g., 375 x 550 mm, would take about a bundle of up to about 5 knives. A box can take many. It's just a matter of finding a right size for your bundle.  First, make a bundle of knives Wrap your knives in a sheet/s of paper individually. Twist the top of the paper and tape it, so that it protects the tip of the knife. Wrap the knives in a tea towel/s, twist the top and tape it tightly. If with a postal tube, put the bundle in a postal tube and fill the gap with things like bubble wraps. If with a satchel, reinforce the bundle with a piece of timber and tape it tightly. Put the bundle in a satchel. Make a roll from the satchel and tape tightly. If with a box, put the bundle in the box and fill the gap with things like bubble wrap. Reinforcing the bundle is recommended. Please understand that we cannot take any liability of damages or personal injuries.