I use one for router bits, one for drill bits, and the third holds what ever Im using on my current project along with pencils, bit holders, countersink bits, small files, a magnetic retrieval tool, and a few screws. I was VERY pleasantly surprised with these. And I actually use my stereo. Returning the ones I received, they wont hold a charge or charge correctly Originally rated 2 STARS because chargeplay clutch charging mechanism arrived defective and would not charge my Samsung Galaxy Note 10+ for more than 1-2% before shutting down. That is the size I ordered and they fit perfectly. Its been two days now and I still have not had to charge it yet. Who puts a bright blinking light on headphones. Fit perfect, felt comfortable and allowed me to move around freely. I cut the ankle strap off and made them slip ons.