You can purchase them here:
Backpack Mockup - Front View
Backpack Mockup - Half Side View
Backpack Mockup - Half Side View2
More Mockups here:
https://yellowimages.com/yi-5ba88c92bb79a/products/objects
Backpack Mockup - Front View
Backpack Mockup - Half Side View
Backpack Mockup - Half Side View2
More Mockups here:
https://yellowimages.com/yi-5ba88c92bb79a/products/objects