What do you use for your pump bag?

I will be going back to work after my maternity leave, and I’ll need to pump a few times a day at work. I’m not sure what type of bag to get for my pump bag though? Actual pump bags are expensive so I was looking at just diaper bags/backpacks or normal totes. Some of the diaper bags have the bottom or back that unzip so you don’t have to take out the whole pump every time which seems nice. Just wondering what other ppl use to get an idea.

If it helps, I am planning to get the Madela double breast pump.