I'm a re-user, too! I love taking jars and containers and using them for new items instead of just tossing them out. I have even held onto them and used them for gifts later on, too.
We always reuse those glass jars that we get, we actually have a bunch of them stored in our cabinets. Even those ice cream containers, we actually keep them and store food in them. I think it would be a waste to throw such re-usable things away, unless you have no more space to keep those containers anymore.
I always keep glass jars for storage purpose but most of the time I keep my change there. I have several jars full of coins and change and it has helped me a lot when it comes paying bills. I also tend to use the jars for spices and other condiments, I use it for coffee, sugar, creamer you name it. But I don't choose every glass jar, I tend to pick the ones that look like they're really made for spices.