This question is for anyone who has r carry a lot of files or work related materials back and forth. What bags/purse do you carry to work? I am trying to find a good sized work bag but I don't know where to start..so many options to choose from. I will mostly be carrying files back and forth as well as teacher materials. Please help by suggesting a few. If you have pics that will be helpful too. *I don't carry messenger type bags* Thanks in advance!