Soon after bringing my baby home, I realized I would be pumping exclusively.  I quickly grew tired of holding the pump up to myself, so I ordered this.  I find that it's a bit cumbersome to get set up correctly, but totally worth the effort once you get it together.
Basically, you get a strapless bra in 3 pieces, plus an extra extender and an adjustable/attachable strap.  The 2 front pieces with the flaps to hold the pump flanges, that zip together up the middle, and a big strip to velco the back together at the correct size for you.  The zip is for the quick on/off when using the bra with the pump.  It's very difficult to get the velco adjusted the first time by yourself, given the industrial strength of the velco that holds the back together.  But, it is worth the effort as pumping truly is hands free when you have this on.

If you pump anything more than occasionally, this is worth the money.