Pumping @ work

I am a teacher and will be going back to work after my six weeks maternity leave. I will be breastfeeding and thus pumping at work. I am trying to get ready and am just wondering how many bottles do you recommend getting to store milk and transport back and forth every day/week. Husband hates the idea of disposable bags. Any other must haves? Any other advice? How much freezer stash should I have to allow for fluctuations in milk production?