NOTE: Mondo Bag comes printed in two configurations. No matter which you have, you will need 4 grid rectangle sections. They are currently printed either 1 grid rectangle on one panel, or 2 grid rectangles on one panel. Also, the original Mondo Bag interfacing has handles printed - you do not need those for the bag and you can check the top navigation bar for the sheet that explains more - Quiltsmart.com / Product Updates / Reference Sheets / Mondo Bag Update 2015 AND Mondo Bag Update 2018 - Panels (this one explains how to make the handles).
This bolt will make 12 Mondo Bags, with 1 panel left over. On this bolt, there are 2 rectangle grids per panel. Four rectangles (2 Panels), are needed for 1 Mondo Bag. 25 panels per bolt.