For the Satchel most low cost materials (placemats, pillowcases, or any type of cloth) will work.
Your satchel will contain your leatherbound Book of Mormon, liahona (schedule), a water bottle, and any small items you may need throughout the day.
Your satchel needs to be large enough for your Book of Mormon, a water bottle, your liahona (schedule - 8 1/2 x 6 1/2”), and any other small items you may need throughout the day such as chapstick. You will have your satchel with you all day.