Question: what is fs paper size?
Answer: Foolscap folio (commonly contracted to foolscap or folio and in short FC) is paper cut to the size of 8 1⁄2 × 13 1⁄2 in (220 × 340 mm) for printing or to 8 × 13 in (200 × 330 mm) for "normal" writing paper. ... The slightly larger size of such a binder offers greater protection to the edges of the pages it contains.