I carry my Cowon J3 + phone on the tube everyday and don't find it a problem. It's thin and light enough that I barely notice it in a pocket. I'd recommend th

I carry my Cowon J3 + phone on the tube everyday and don't find it a problem. It's thin and light enough that I barely notice it in a pocket. I'd recommend the Sansa Clip if you are going to leave it in the car - I leave mine in my gym bag. The sound quality is great, and it's cheap enough that it's not a huge deal if it gets lost/stolen.