I recommend an industrial walking foot sewing machine Like the Juki sewing machines industrial at Goldstar global for straight stitching.
Materials
For backpack:2 yards of fabric
Ripstop nylon fabric (2 yards)
Nylon webbing 1"(with reflector strips) (4 yards)
2" Seatbelt webbing (1 yard)
1" Webbing binding tape, a sports mesh fabric (.5 yards)
1/8" Closed cell Volara foam (.5 yards)
1" Aluminum cam buckles (x2)
2" Quick-release buckle (x1)
1.25" D-rings (x2)
2" Velcro (5")
12" Zipper (x1)
Following are the steps you will need to take to create the perfect DIY backpack:
Step 1: Creating Your Design
Step 2: Edit pattern and Cutting Fabric
Step 3: Sewing Pockets-Use your Juki sewing machines
Step 4: Preparing the Side and Bottom Pieces
Step 5: Sewing the Straps
Step 6: Creating the Back Padding
Step 7: Adding the Zipper Pocket
Step 8: Basting Together the Front, Back, Sides, and Bottom Pieces
Step 9: Binding the Outer Raw Edges/finishing touches