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.

Slice 10514 Mini Cutter, Ceramic Safety Blade, Pocket Sized, Auto-Retractable, Stays Sharp Up to 11X Longer Buy on Amazon

Slice 10554 Utility Knife, Automatic Retracting Blade, Safe Ceramic Blade Lasts 10X Longer vs. Stainless Steel Buy on Amazon

Slice 10512 Pen Cutter, Auto-Retractable, Stays Sharp up to 10x Longer Than Steel Blades, Dark Grey Buy on Amazon