I personally use this model and love all the features. Plenty of zippered pockets for all your long days of officiating.
Embroidered with region Logo & personalize with your name 
600D 91/9 polyester/polyurethane
70D ripstop nylon lining
Padded internal laptop and tablet sleeves
Fits up to a 17" laptop
Padded shoulder straps and back panel with mesh inserts
Sternum and compression straps
Three external zippered pockets
Two side pockets
External front lower zipper pocket