I actually made that one for myself but decided to post it to see of it would sell and as you can see, it did. I made it with opening cardboard boxes in mind. I'm right handed so I did a left hand chisel grind so that the flat would be on the bottom and the bevel would be facing upward when opening a box right handed. This grind helps keep the blade level when following the edge of a box. A lefty would need the bevel on the other side. I also put that little upward angle on the edge so that the blade would slice into the cardboard at a steeper angle without having to intentionally angle by hand. I hope all that makes sense. I open a lot of boxes so I put a bit of thought into it. The Sheepfoot tip with a straight edge should also handle other cutting tasks as well. Again, the angle will allow for plenty of knuckle clearance when cutting onto or into a flat surface.
I have a few of these blades already heat treated and ready to finish. Some are slightly different. If you're interested let me know and I'll email you a pic of the blades and you can pick out the one you like best. You can also specify handle material, sheath, etc.. Feel free to email or call using the contact info in my sigline below.