The build of the headphones are excellant, the design is neat, and are very comfortable to use. Sennheiser have addressed this issue, and the Sennheiser PX100 are suppilied with a solid case. The actual headphones fold compactly, and fit in a small case. Excellent to throw into a work or school bag.
 

I have purchased a few sets of headphones in the past spending as much as £50 on some, I never use the ones supplied with my ipods and I never got the true sound that I thought I should be getting. I brought the Sennheiser PX 100's as I remember they had a good review in a mag I once read, they look plasticky and cheap but they certainly deliver the sound quality I have been after for so long, I kept switching from these and back to my old ones playing the same track, because I couldn't believe the clarity I was missing. Yes I like them!
 

The Sennheiser PX100 headphones have lived up to Sennheiser's quality name ,as I expected. They are smart and stylish, and produce perfect sound quality, much better than anything else in it's price range! Highly recommended for anyone with an iPod, high quality MP3 player, or CD Walkman etc... ...
 

They are light, sound fantastic, plenty of bass but never too much. They sound good at all levels, and my Creative Zen Touch drives them very well without any equalizer on. They also fold and go into a protective case, which is good to know they are protected in the bottom of your bag. As they are the open type, they may not make you friends on a train, but you can keep the volume down and still hear the outside world. They are as comfy as they are light, and I recommend them.