Make sure you always have a box cutter on hand with this disposable steel Jiffi Cutter with replaceable blade. Changing the blade will save you the trouble of having to get a new knife every time the blade gets dull.
I use this product at work when I have to cut up boxes and throw them away. The box cutter is convenient and handy, fits right in my pocket without taking up too much room. One thing I don't like about the box cutter is that when it is first used it's a bit stiff.