My grandson asked why I always put his library book in his backpack but it's still on the kitchen counter when we get to school

I told him Grandma has a very organized system.

I put the book in the backpack the night before. Then I take it out to double-check the due date. Then I set it on the counter so I remember to put it back in.

Then we leave.

Punchline

The system works perfectly—right up until the part where we actually need the book.