Primitive Pieces by Lynda. I'm not sure how "necessary" they are but they were sure fun to make!
I made a sample for me so I'd be familiar with the construction. The bag on the left opens at the top and fits a quilting book perfectly. The 3 cotton pieces are pockets on the front. I did the applique in wool.
That is a little sewing rollup on the right.
Here is the roll up opened. There is a pocket at the top and little pockets at the bottom right above the year.
Here are the two pattern/book bags I made for a shop sample. The little one will hold patterns and whatever else you might be toting along.
These were fun to make! If you have the pattern I suggest appliqueing before sewing the front and back together.