Directions are a little sketchy but I have no pattern.
2 pieces fabric 12” x 29” plus scrap for binding in handle area
2 dowel sticks 1/2” x 10”
1 piece 1/4” plywood 8” x 11”
2 terry cloth hand towels - thin is best
Lay the fabric pieces right side together, use a small bowl to cut a rounded opening 1.5” x 4.5” in the center of each 12” side. Bind them with scrap. These openings will be handles when completed.
Sew the 2 fabric pieces together across both short sides from binding to corner. Backstitch at the binding. Now sew one long side. The remaining side can be sewn too but leave an opening 9” in the very middle. Turn right side out. Slip dowels inside opening and push up to each 12” end. Turn raw edges of opening under & stitch both sides of opening but not together. It has to be left open like a pocket so plywood can get placed. Imagine now the plywood is in & make a pocket by sewing across from long side to long side. This makes a 9” pocket for plywood. Sew one hand towel to middle of pocket on long side that’s closed entirely. Sew other towel to opposite long side where pocket opening will be - but just sew towel to one layer. Slip plywood in pocket.
place 9x13 pan in center, fold towels up over pan, fold dowel sides up over pan. Dowels will be seen in the rounded openings. Grab dowels & carry.