The weight capacity of pallet racking systems can vary depending on factors such as the type of racking system, the design, and the quality of materials used. Generally, pallet racking systems can hold anywhere from a few hundred pounds to several thousand pounds per shelf level. It is important to consult the manufacturer's specifications and guidelines to determine the exact weight capacity of a specific pallet racking system. Additionally, factors such as the size and condition of the pallets being used and the distribution of weight across the shelves should be considered to ensure safe and efficient storage.