I don't know how I would feel about using a Benchmade Bedlam to open up a bag of soil with rocks, sticks, dirt, etc...
I use a Spyderco Delica to open bags of dirt and rocks.
The edge gets all dinged up, but it straightens out when sharpened.
The Delica/Endura is the most knife you can get for $60, and super solid with the steel liners and VG10 blade.