On my work breaks, I often have to pump in the car while it's sitting in the parking lot.  This has saved me a lot of hassle as I can put it, use my nursing cover over it, and then just relax, play on my phone, etc. for 15-20 minutes.  I am a 40DD and the L/XL fits great but it would work for larger busts as well.  I use the Medela Pump in Style and it stays put and holds the pump great!  I definitely recommend!