Weights in bookbag

How do i add into my exercise journal that i went jogging, but with weights in my book bag. It was only a 8lb dumb bell in a regular book bag stuffed with clothes so it didnt irritate my back while it bounced around.

Or could some tell me how many calories extra that burns so i can add in my self?

ty everyone, next thing is to get one of those masks that intensify your workout by cutting alil of ur oxygen intake