A:Answer Thank you for your inquiry! the interior dimensions of the Insignia™ 21 Cu. Ft. Garage Ready Convertible Upright Freezer being 26 inches wide × 15.6 inches deep × 66.7 inches high, a standard full-size sheet pan measuring 26 inches × 18 inches will not fit flat on the shelf. While the width is just enough, the depth of 15.6 inches is too short to accommodate the 18-inch length of the pan. You might be able to fit the pan diagonally, depending on the shelf spacing and clearance, but it won’t sit flat. If storing sheet pans is a priority, you may want to consider a unit with a deeper interior or use half-sheet pans instead. Keith | Insignia Support