Step 9: Open up the backside for the LED wiring
Once you've got your eyelets sewn, you can place the liner side of the bag against the outside and with a small pen, mark where the eyelets are on the heavy interfacing. Once you've got the locations marked, you'll be able to see where they'll sit on the opposite side of the bag. You can create a small window for the LED wiring and even cut the liner fabric to fold to limit fraying. I sewed this liner directly to the interfacing to create the window.