You’re going to want to go with a Hospital-Grade Breast Pump.
Hospital-Grade Breast Pumps
Pros: They’re fast and efficient. Many are also light, comparable to a midweight, personal-use automatic pump.
Cons: Even though some come with a rechargeable battery and an adapter for use in a vehicle, many don’t come with a discreet carrying case. You wouldn’t want to lug one to and from work every day because it can be awkward and heavy.