would this bag have enough room for umpire gear behind home plate?
This bag will gold a set of umpire equipment. It is about 30" long and has a top and bottom compartment to separate clothing from equipment. Our most popular bag for umpires to us is our Champro Deluxe Equipment bag. It has more room and no doubt will fit all of your equipment no doubt.
Does this bag have a section to hold rule books, note books & non clothing items?
This bag has many pockets. I'm sure there is a section of the bag that you could use to put those sorts of items. This is probably our nicest bag we've ever carried.