Removable strip provides clean and quick seal upon contact. FSC Certified®. Security Artline. White Wove. Side Seam. 24 lb. #8. 3-5/8" x 8-5/8". Top Window Size: 7/8" x 3-1/2". Top Window Placement: 2-1/4" from bottom. Bottom Window Size: 1"x 4". Bottom Window Placement: 5/8" from bottom. 500 per box.