Hifiman RE-400 in their case. This is what TSA sees in your luggage. It kinda looks like an egg sac..blech. Notice that the zipper around the outside is plastic. Also note how the aluminum of the earpieces is easily penetrated by the X-rays, especially compared to the steel and copper of the drivers/cables. PS:The eartips look like throckmorton sign. ...You don't want to know. It's NSFW.