I Always carry a small pocket knife , something simple like a Swiss army or victoronix , or even a cheapy knockoff from ebay, it's just one of those things I use constantly for cutting ballistic plastic packaging , sharpening pencils , slicing BC 5 point apples ..
When I need serious knife power , I got a couple Ontario rat2 or 3 models , forget which is which , high quality knives tho , the best I own.