How about some leather work gloves & a small pry bar for if you had to escape through a blocked/jammed door & or broken glass or other obstructions.
For the space that theyd take up, a garbage bag & some paracord would be woth chucking in the bag, too.
How about a rolled-up Platypus bottle that you could fill from your office cooler/bathroom/water fountain? (Some puritabs would be handy too)