Working moms who pump

Help me out! I work part time and am planning to nurse again. I technically only need to pump once a day, but 1-2 times a week I pump at least twice, sometimes 3 times. On my long days I struggle - how do you pump long enough and take care of all of your supplies/cleanup?? My short days I just pump into my bottles and take it home, deal with cleanup at home. My long days what I was doing was pumping into bags and then combining into one bag after that session. I needed my full 15 minutes to pump, so I was literally just using a bag to pump into and then had to toss it. Is this how everyone else does it? Is there a way to not be so wasteful without having to wash bottles??