I have a bunch I like. Lots of great ones have been mentioned. My favorite fixed blade knives for game are a custom D2 steel Personal by Harvey King and a Battle Horse Blackwater in O1. Both are real comfortable and hold a good edge. I do carry a Cabelas ceramic steel that weighs 2.5oz when I pack one of these I use more than I really need to. A friend who is an elk outfitter got me started carrying a steel. He had a VG10 steel Spyderco folder and would use it after every quarter to keep that razor edge.
I like the Havalon and Outdoor edge replacable blade knives also on game. I like the Piranta for caping but prefer a bit larger blade personally for everything else. The Outdoor Edge is my favorite of them for all around use. One blade on the Outdoor Edge lasts a long time if I hit it on the ceramic steel when using it around home, and I can bring a used one right back to razor sharpness with it also when I get home. That said I don't like being out to far without a sturdier blade. I would probably never break one of these knives to where I couldn't use it, but I never want one to be my only blade. Just a personal thing for my peace of mind.
When counting ounces I use an old Gerber Bolt Action Exchange blade folding knife. I have picked up a few spare blades so I can swap them out as I dull one like a Havalon or Outdoor Edge, but still have a sturdier knife with me. The knife, 2 spare blades, plastic blade sleeves for the spare blades, and a Gerber sheath for a different knife I keep the blades in weighs under 5oz. I can lighten it up more carrying only one blade without the case but usually don't. I carry the knife with the drop point Utility blade in it for camp chores or other cutting I find reason to do. When I get to game processing the guthook Skinner and the Hunter blades get used, and are still razor sharp since I didn't use them for other stuff. Those knives can be found on Ebay used, I think they were made from the mid 80's to the mid 90's. Between the 3 blade shapes there is a perfect one for most stuff. It's heavier than a Havalon or Outdoor Edge with spare blades, but is a heavier built knife and really safe to change blades on. There is a saw blade for it too but I seldom carry it. If I want a saw I would rather have a larger one than the 4" saw for the Gerber knife.