If you get a lot of packages, you know that this involves opening them up - usually with a handy, available sharp object.
About a year ago I discovered these ceramic cutters on Amazon and love them.
I have them scattered around the house, garage, and in drawers. I prefer the auto-retractable ones so our kids don't get hurt. The blades stay sharp for a long time, and you can also order replacement ceramic blades. They are really great and I highly recommend having a few of these.