Check out LOWEPRO MILITARY TACTICAL BACKPACK 3D model on CGTrader for $10. High-quality mesh by DeveshL: 96163 polys, 98712 vertices. PBR, Textured, UV Mapped.
BLEND (Blender, filesize: 5.7 MB), OBJ (OBJ, filesize: 3.88 MB), FBX (Autodesk FBX, filesize: 5.6 MB), GLTF (glTF, filesize: 3.24 MB)