Here is another tool I bought back in 2013 and I love this thing.  I do a ton of shipping for my business and almost every day I need to cut a box for one reason or another.  A razor knife can be a bit unwieldy and dangerous if you are not careful.  Scissors will kill your hand after awhile and the boxes really take their toll on them.  The solution is an electric box cutter.  These are very easy to control and completely effortless.  Best of all the blade doesn’t seem to wear out, I am working on my 3rd year with the cutter I have and have not had to change the blade or do any other maintenance on the tool.  Unfortunately the specific Skil Multi-Cutter I use has been discontinued and can be hard to find.  There is however plenty of other companions selling products with basically the same design.

Here is a video from a few years ago demonstrating how the cutter works: