I've been packing a Leek Composite Blade, with the D2 Edge, for about 3 years now. I lost my original in London, when I got in line to see the Houses of Parliament. Before I realized my Error, I was Stuck in line & lost Both my Leatherman Wave & my CB blade Leek....No locking Blades in the U.K. & yes, I knew. If I were dicing up Heavy Cardboard, I'd forget about a knife, & buy yourself a folding Razor Blade Holder Knife. They sell different models, & are available from Home Depot to Sears, Costco & Beyond for less than $10 bucks. My personal favorite came in a 3 or 4 pack from Costco & uses Typical Double Edged Stanley Blades, that you can buy by the 100 for around $8.00. The one I have I've been carrying, for dailey construction work, I've had for 5 years now! NOTHING is Harder on a blade than Cutting Cardboard, Especially if you have to cut against cement. This way, no matter WHAT you cut, you never have to sharpen your knife, you Always have a Fresh Clean Point & Edge, & most times you don't even need to buy your own blades! That's Construction Man Tip #1.