If your planning to work full-time (more than 25 hours per week and/or more than 10-12 pumpings per week) then you are going to want a Midweight, Personal Use, Automatic Breast Pump.
Midweight, Personal-Use, Automatic Breast Pumps
Pros: This is a quick and portable way to double-pump and fills up a bottle in minutes.
Cons: It’s probably more than you need if you plan to pump only occasionally. The pump can be a lot to lug if you’re also carrying other things.