600D Oxford fabric is a type of nylon or polyester fabric that is commonly used in outdoor gear and bags. The "600D" refers to the denier, which is a unit of measurement that indicates the thickness of the individual fibers in the fabric. The higher the denier, the thicker and stronger the fabric. "PU" stands for polyurethane, which is a type of coating or laminate that is applied to the fabric to make it more waterproof and resistant to abrasion. <https://www.oxfordfabric.net/p....roduct/oxford-fabric
