This fabric treatment is a lot like scoring paper to get the right folds. However, in this particular design, the use of "scoring" is not to create a fold line but to make a design detail in an otherwise plain fabric.
Draped wool backpack in black. Tonal leather trim throughout. Carry handle at top. Adjustable shoulder straps. Zip closure to main compartment at back panel. Zip pocket at bag interior. Tonal stitching. Approx. 12