Many of us already know the phrase you take care of the ounces, they will take care of the pounds.
The principle being that it's easy to add a feature, or capability, so hard to loose pounds in your rig, ruck or rifle. But if you make good small choices, they add up. Carry that sensitive item in a small plastic box, not a big metal one. Or a small padded nylon case. A couple ounces, but you make a few more of those choices and you have lost a pound.
And nothing makes you appreciate loosing a few pounds like carrying it up a mountainside, or having to carry it for two weeks straight. Done both, and it's still a hard lesson to retain. Many joes and boots and probbies don't get a chance to test themselves enough, or consider the occasional ruck run a rare, training-only occurrence so it's hard to drive the point home.
Well today while walking I found this on the ground:
A one ounce weight from... something. And you know what? It's heavy. We rarely get to see an ounce as a single hunk of steel. It's hard to tell the difference between 22 and 23 oz, or to get the impression that an oz of fabric weighs anything. But an oz of steel in your hand is a lot. Who wants that?
So, I think this is a good object lesson. I still carry my P38 on my keychain (where'd that thread go?!), and now I think I am going to carry this around as well. I encourage you to think about the same, or make the gear whore junior people you have to train try this. Get an ounce (a fishing weight, whatever) and take care of it. Carry it in your pocket for a week, and see how much more you think about the weight of items when you next pack your bag, or put stuff on your belt/lbe before work.