I bought the 10 pack about a year ago for use in my classroom. It took a whole school year for the first one to go bad. That says a lot. I bought another set because students who came with their own headphones liked these better and I wanted extras on hand for replacement, when needed. All my students use chromebooks and they work perfectly. I didn't realize when I initially bought them that there is a volume control on the headphone wire. A few times I had to troubleshoot when a student said they weren't working and it was only because the volume on the headphones were turned down. They don't come with a storage back, but I use gallon ziplock bags and store them in a tub. Awesome purchase and affordable!I bought these for a classroom set. Half of them quit working all together in less than 2 months. Most only get sound out of one side of the headphone.Very frustrating!As a teacher I needed some headphones for my students to work on some listening activities in class. I’m glad I got them. They are comfortable, with volume control, and work great with the chromebooks. The headphones are in a nice material easy to sanitize after each use. Great value for money!Economy quality but works fine for the great price! Seems to be sturdier than the $5 earbuds that hurt little ears that students bring from home. Leatherlike ear covers are far better than the cheaper foam type. Will see it can make it to the end of the school year :)these were great for studentsPretty durable which works well for my class of kindergarteners. Sometimes the sound on a few of them only comes through one ear, but not often enough to cause it to be much of a problem. The volume on the side is nice too as ithe made it easy for my kids to control the sound once I taught them.I've polled money and ordered 4 cases of these headphones over the last two years for my daughter's classes. They've worked out great and I haven't received any complaints from parents or my own girls. Well worth the price. We've purchased other more expensive fancy (unicorn, light up, purple) headphones and they haven't lasted six months. Definitely recommend these.Ordered a set of 25. I opened three of them and all three of them had the same issues. Sound quality was fuzzy, but probably acceptable for the first graders who would be using them if you got the cord in the exact right position. If you move to the cord or turned the jack they would go out in one or both ears. These were the same issues I had with cheaper headphones I bought and returned. I had hoped that after spending almost double on these headphones that they would work better.