One thing I occasionally see down here is packaging that's designed to be useful even after the product that came in it is gone. While it does disturb me that everyone drinks instant coffee in a coffee-producing country, I like that one company sells it in these glass mugs.
It also comes in smaller glasses. They're what I drink out of every day, and hopefully I'll have room to bring them back to the States with me. Years ago, I brought back dulce de leche that came in nice little Tweetie Bird juice glasses. In Bolivia, our desert guides put small plastic tubs of margarine on the table that had handles so they could later be used as mugs.
You never see this in the United States anymore. I'm pretty sure this was common from the Great Depression through World War II, when it was patriotic to be frugal. Growing up, when my family went camping, we drank out of plastic mugs very similar to the ones I saw in Bolivia. Some of them even had markings inside to show 1/4, 1/2, 3/4 cup so you could use them as measuring cups too.
Of course you can use a peanut butter jar for a drinking glass, but unless it's actually designed to look like a glass, without a screw-cap lip, nobody wants to. I'm sure the demise of this kind of design-for-second-use had to do with the prosperity and upward mobility of the 50s and 60s. As middle-class people started to be able to afford to throw away perfectly good glasses and buy new glasses that had never contained coffee or jam, buying reusable packaging must have become a reminder of hard times, a sign you weren't prospering, an embarrassment. Not reusing became a sign of affluence.
Once reusability quit being a selling point, corporations must have had no reason to make it easy for you to forego buying more stuff. In fact, they could sell you the same item twice by making packaging less reusable. So no more refillable beer bottles (still the norm here), no more dishes that come free with your food, no more flour sacks printed so you can sew them into dresses. The civilized thing is to throw it all away.
By now, we've forgotten it's even possible. Maybe we should try to remember. Why waste the energy and resources to make everything twice? Why buy a glass when a jar of olives is so close to a glass? But why should we buy olives in jars, when they could just as easily be sold in glasses?