They are using them a lot. There is too much space between the rear and front supporting crossbars, and if bottles shift even slightly, they slide off the rear support and fall down in the center of the rack, breaking bottles below them,. Love these so much I bought another pair. The attached pictures are of similar Danskos that I wore as a practicing Midwife for 13 of my 23 years catching babies at a busy urban Hospital practice. Quality is fine, and this fit the headphones well. I’ve got Penzey’s standard jars plus McCormack 4. You get what you pay for, so I should say that they are good for the money you pay. Sonically they are superb. You attach a very compact clamp to the bike frame that doesnt bother you at all if riding alone. And i like that you can control the volume level from the earbuds.