Oh my Bag!

On April 22th, I had a bad thing. I worked at part-time job after university until 10 p.m. I was talking with the member of this job and went to ride on my bike. I was going to go eating with my friend. First of all, I hanged my bag the rear of my bike in order to put my clothes in a carrying box of my bike. Then I fitted a key into a lock and put my clothes in the box. After that, I started the engine, and went toward a restaurant. A few minutes later, I noticed that I had no bag. I stopped my bike and consider where was my bag. When I found the tie of my bag, I turned pale. I ran my bike with hanging my bag at the rear of bike. I grabbed and looked at my bag. A part of my bag turned black. I shouted in my mind "Oh my Bag!!" [161 words]