[Raion]

Since we're on this:

I use instapak as well, which works equally well. I wrap the system in fine bubble wrap or crumpled newspaper, and then tape it all in place. Then instapak is used in several pieces to fill voids and create a padding around. Any negative space is filled with packing paper, pieces of cardboard folded to provide flex, and such. The secondary box trick can help too!

Fiber backed tape is a good tip and I use it to prove tampering by the shipper in several cases.

In the past I lived in a place where I was reloading ammunition and the powder can be so fine as to be difficult to clean up. Don't be a fucking moron like I was and make sure to keep all your reloading materials in a different room from your packing materials/station. It can come up as bomb residue, and inspectors don't give a shit and will rebox/repack your systems as they see fit.