Heavy Duty Clear Zipper Top Treat Bags are deluxe 3.5 mil laminated bags with polyester exterior and polyethylene interior. Composed of 3.0 mil polyethylene and 0.5 mil polyester. User-friendly zipper for easy opening and re-closing. Heat sealable with notches above zipper for easy consumer opening. Polyethylene interior ensures a tamper proof seal. Polyester provides increased heat resistance, high barrier protection, while increasing the stiffness of the film, allowing the bag to stand up straight for display purposes. Heavy Duty 3.5 mil bags offer maximum stiffness qualities. 3/8 inch sealed side seams. Saran coated for high oxygen, moisture and aroma barrier properties. Stand-up bottom gusset for maximum display. Complies with FDA regulations for food packaging. Made in the USA.