Pumping at work

Lindsay
So I sadly have to return to work in three weeks after a wonderful 14 week maternity leave.
My question to you mommas is what spare parts do you recommend I have in my pump bag? I have a medela freestyle. I have access to a fridge so I plan on just putting my pump parts in the fridge in between pumps to avoid the need for cleaning. 
Any other pumping at work advice??