At the very bottom of the backpack I found this photo:
It is torn in half with the corner missing. The photo is of John William WALKER my husband's great grandfather.
William was born 17 May 1876 in Burley, Yorkshire, England. He died 5 Sep 1945 in Bridgeport, CT.
As far as I know, this is the earliest photo anyone in the family has of William.
Here is the photo after restoration: