Bought a new magnetic tank bag today for the bike...filled it by about 1/3 with my things, and then went for a ride

I was doing not much over 65 and the bloody thing flew off, hit my chest,leg and tumbled behind me in the road. It was a bit of a surprise to me but I kept in control.... Thankfully no traffic behind me other than Scotty who managed to avoid it and rescue it from a field. It is now rather worse for wear and I will be taking it back. NOT IMPRESSED. > >