The ornamental design for a paperproduct, as shown and described.
The sole FIGURE is a top plan view of a paper product showing our new ornamental design. The outer perimeter of broken lines indicates that a specific length and width of the paper product forms no part of the claimed design and that the pattern continues uniformly throughout the entire surface of the paper product.
The surfaces or portions not shown in the drawings or described in the specification form no part of the claimed design.