Bands are good for portability, and I like doing some exercises with them at home because they prevent "cheating" in the same way rings do and allow for some unique exercises.  I've tried a few brands, and the Black Mountain ones are pretty typical.  I have the red one, which is still fairly thin.  This type of band has the handles attached rather than clipped on, so bands can't be combined.  If you are okay with that, I think you'll be happy with these.  The handle is comfortable and they work well.