Back when I got in to doing long hikes people on the trail acted like family.
Say you stop and upgrade a piece of gear you see someone with lesser gear you pass down your old one.
I was at Neels Gap the other day and watched a guy send home a $8 water bottle replaced with a liter one. when his buddy was using a old plastic canteen that had to weight 4 pounds empty.
I really hope this is a rear thing to see.