I use the ponytail holders, too. Then I stick my bobbins in an empty straight sided pill bottle for taking to classes. Also, I will often use smaller pill bottles (with straight sides) for holding bobbins of the same color. I hate when I am on a roll and doing a project and I have to stop and wind a bobbin. Since I mostly use: white, black, light taupe and dark taupe threads for my projects, I keep these bottles filled at all times.
I also use the medium and large black binder clips for holding a stack of blocks together. Which reminds me that I had better go get some while the school supplies are out.
I still have my gallon of Elmer's Glue that I bought 2 years ago, so I don't need any of that, yet.