Mystery of the Wet Backpack SOLVED :)

Billie (5) started Kindergarten and gets to take a backpack now.  I noticed this week it was coming home wet.  I couldn't figure it out.  I pulled out the papers and looked.  I suspected she was dropping the water bottle in the bag without having the lid on.  She said she was not.
I even went so far as to forget the water bottle to see if it would get dry...

Today the teacher sends home a note

If you can't see the pics, there was a mushy pear she put in her bag one day at lunch... yuck... and somehow I missed it each time I looked in the bag.  Its in the wash now.... hopefully that helps.

In other strange events from today... I helped the husband catch grasshoppers for fishing tonight.  They make a lot of noise inside a bottle.

UPDATE on the backpack --- it survived the washer on delicate... now its drying out.