What is the best way to transport you omega bottle and refill gear?

I've been wondering what is everybody else is doing? Are just letting the Bottle roll around on its own or maybe a towel or block to chock it. What keeping it from getting damaged? Is any using some kind of bottle bag, caddy or cart? My wife took one look at the bottle and said you need to go down to medical thrift store and buy one of those oxygen bottle hand carts! It didn't sound too bad, after carrying every thing out to the back yard for a after noon of plinking takes a minute. I like to hear and see your ideas. Thanks Monte 
 
I currently fill with scuba tanks and they REALLY aren't too much fun to schlep around! Just bought another gun, but am going to have to break down and get a CF pony tank soon. I make sure my tank can't roll around in the car or truck, using whatever it takes (sand bags, towels, gun cases) to wedge the tank in place so it won't move. A moving tank in vehicle is dangerous! Joe B. form Airtanksforsale has a kit with feet and an armor net to protect your tank. A lot of FT shooters adapt an inexpensive Harbor freight dolly to hold their scuba tanks, probably a folding luggage dolly would work great for the lighter CF tank.
John