The PX 100 was the first pair of Sennheiser headphone I bought and frankly I will only buy Sennheiser for headphones. Sound quality aside, which is fantastic by the way, the build quality of these headphones in unmatched. The headphones come with a hard carrying case which holds and protects the folded headphones. If you get the newer version of these headphones the PX 100 II a pouch is included. Either way these headphones can take a beating. The only downside I can think of is the 3.5mm headphone jack. At times, when listening to music while your ipod is in your back pocket, the jack distorts a bit and you can hear some of the channels fade a bit. Best to buy an L adapter to prevent this. A final note - the service department of Sennheiser is fantastic. They honor their warranties and know how to treat customers.