Don't give those folks $28 a month. For under $150 (likely significantly less as you probably have most everything you need already) you can put together a good 72-hour kit to keep in your car or at home, and a get-home bag (GHB) to get you from your office to your home.
Here are a pair of good, layman's terms "What do I need?" lists for "bugging out" or "bugging in":
http://artofmanliness.com/2011/03/07/ho ... vival-kit/
http://artofmanliness.com/2012/11/01/ho ... -disaster/
As far as a get home bag goes? Here's what I keep in mine:
-Food. I keep enough food for 24 hours worth of eating. MREs are compact, lightweight, high calorie, and you can eat them outta the bag, so I keep two in my GHB.
-Water. I have a 32oz Nalgene bottle that I fill up at the water cooler and use around the office, and I keep 4x 20oz sealed bottles of water in my GHB.
-Gerber Multi-tool w/ knife, small hammer/pry bar combo tool, compact roll of duct tape, 50' of paracord, some carabiners. You never know if you'll need to lift something up, lower something down, fix something, tape something, or break something in an emergency.
-Bandana. A good headband if it's hot, scarf if it's cold, bandage if you're bleeding, or makeshift carrying pouch for extra stuff.
-Comfortable footwear. An old pair of sneakers beats the hell out of walking home in your office shoes. Snowboots/workboots are also good to keep around as seasonally appropriate for the winter.
-Spare clothes and extra layers. Jeans and an old t-shirt or hoodie is way more comfortable than a suit if you have to hoof it home.
-Umbrella or poncho
-Basic first aid kit. You don't have to be prepared to do amputations, but bandaids, gauze, antiseptic, alcohol wipes, some useful over-the-counter meds, tweezers, and some medical tape would be good.
-Flashlight, dust mask, pepperspray (or other non-lethal option) in a readily accessible pouch. Flashlights are always handy when the power goes out in a large office building - more light is always good! A dust mask will help you keep concrete dust out of your lungs in the event of a building collapse or fire. Pepperspray is a quite useful deterrent against multiple aggressors in a riot situation (spray and pray!).
-Self defense firearm + ammunition. (I have an office that's OK with this - if yours isn't OK with firearms in the workplace, assuming you commute by car, your car's trunk is a good place for this)
-Spare batteries, battery powered cell phone charger, and handheld HAM radio (Baofeng UV-5Ra 2m/70cm handset)
I keep a spare sleeping bag in the trunk of my car, too.
You can get a tacticool-looking bag like the Maxpedition Versipack, or you can throw it all into a nondescript bookbag that you can keep under your desk without looking like the office apocalypse prepper.
My get home bag came in handy a few winters ago when we had that freak snowstorm here in DC. I got caught up in commutergeddon downtown - it took me 15 hours to get out of DC back to Alexandria, and by then, there was enough snow and ice on the road that I couldn't get to my apartment. I slept at my office, which had no power at the time, but I was pretty comfortable thanks to the spare clothes, sleeping bag, MREs, bottled water, and flashlight...
Remember - for a Get Home Bag, you don't need to prepare for the zombie apocalypse (that's what your 72 hour kit is for)... just be ready for day-to-day situations that will cause you to be away from better resources and comfort for 24 hours (like weathering a freak snowstorm at the office), with the ability to react to an urban disaster (like a building collapse), or the ability to defend yourself in an urban disorder situation (like a protest out of control/riot).
Increase your chance of surviving the wilderness, urban riots, or the zombie Apocalypse."