Erin Backpack Sew Along - Part 6a: Assemble the Exterior of the bag

It's time to Assemble the Exterior of the Bag in the first half of Part 6. You will add the main compartment zipper and work through all the Y-seams. This is a supplement to the written instructions found at the link below.
For the full Part 6 blog post, you can find it here: www.iloveyousew...
For the pattern: loveyousewpatt...