Open all compartments, empty the content and brush the lining of each pocket.
Make a list if you are ambitious.
If you are really, really ambitious, you note the number, make a list and take pictures.
This task should lead to a feeling of gratitude for everything you have and possibly an overwhelming feeling about everything you have.
It should not generate a need for new bags. If it does, go count the number of plastic bags you have saved.
I did this today, also inspired by an old post at Händelsevis. I have 34 bags.