A Winter Ride turns into Fire

I rode in to work yesterday along the River Bottoms.  The commute in was about 14 miles and 1:45, definitely a slow go on the snow covered trail.  It was a good ride in other than the messenger bag constantly shifting on the bumpy trail.

I have commuted to work numerous times but have never ran into the burning messenger bag until today.  Of all the numerous times I have thrown my light in my messenger bag for the commute home, I have never had my light turn itself on.  This is not a good situation, things get hot in a hurry and items get wrecked.  Thankfully my fire was caught and put out quickly. The only thing that really got damaged was my shoes that have a hole going right through them.