The point about bringing things that you do not use, but someone else might, is a good one with Scouts. When I had a troop, it seemed like there were always extraneous folks around - a couple dads volunteer to go along, we're on a Scout property where there are lots of adults around (not all scout outings are backpack trips), etc. It seemed like there was always someone around with a higher level of expertise, but no supplies. So, I can see how carrying stuff you don't know how to use can make sense.

Of course, you shouldn't be counting on those random adults just showing up. But I'll bet you aren't.