I use those three hole binder paper reinforcements to hold the loose end of the thread onto the bobbin (I wind the thread very close to the end, then bring the loose end up onto the side of the bobbin, and hold it in place with the reinforcement). 300 reinforcements for a couple bucks at the dollar store or W-mart, makes them cheap. That leaves the hole of the bobbin open to use golf tees, or other products that need the hole open to store the bobbin. Then I keep spools with their corresponding bobbin in those ridged styrofoam trays that sausage come in. They stack well, there's room for spool and bobbin side by side. They are easy to organize however one wishes - by colour, by type of thread etc. They also fit inside a ziploc baggie to keep dust free or for transport.