Dad and I talked about this a lot. I had a small multi-tool in my pack when I first started backpacking. I never used it, not once. I have nothing in my pack where a Philip or flat head screwdrivers would/could have been useful. I couldn't find or think of anything for Allen wrenches. I couldn't think of anything I would use pliers for except pulling stakes out of ground, but I used that tube that came with Big Agnes Seedhouse tent to pull my stakes out. (Maybe you guys could give me other uses for pliers!) I originally asked for a fixed blade knife, but instead my mawmaw got me a folding knife for Christmas that is pretty darn cool. So, now I just carry a folding knife with 4-6 inch blade. (I forgot the exact inches.)