diff --git a/Models/backpack/ao.jpg b/Models/backpack/ao.jpg
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diff --git a/Models/backpack/backpack.mtl b/Models/backpack/backpack.mtl
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+# Blender MTL File: 'None'
+# Material Count: 1
+
+newmtl Scene_-_Root
+Ns 225.000000
+Ka 1.000000 1.000000 1.000000
+Kd 0.800000 0.800000 0.800000
+Ks 0.500000 0.500000 0.500000
+Ke 0.0 0.0 0.0
+Ni 1.450000
+d 1.000000
+illum 2
+map_Kd diffuse.jpg
+map_Bump normal.png
+map_Ks specular.jpg
+
diff --git a/Models/backpack/diffuse.jpg b/Models/backpack/diffuse.jpg
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diff --git a/Models/backpack/normal.png b/Models/backpack/normal.png
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diff --git a/Models/backpack/roughness.jpg b/Models/backpack/roughness.jpg
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diff --git a/Models/backpack/source_attribution.txt b/Models/backpack/source_attribution.txt
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+Model by Berk Gedik, from: https://sketchfab.com/3d-models/survival-guitar-backpack-low-poly-799f8c4511f84fab8c3f12887f7e6b36
+
+Modified material assignment (Joey de Vries) for easier load in OpenGL model loading chapter, and renamed albedo to diffuse and metallic to specular to match non-PBR lighting setup.
\ No newline at end of file
diff --git a/Models/backpack/specular.jpg b/Models/backpack/specular.jpg
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