25 Heavy-Duty Black Zip Lock Mylar Stand Up Pouch Bag 20x30cm (7.9x11.8") Colors (Front/Inside/Back): Black/Silver/Black Outer Size: 20x30cm (7.9x11.8"), Inner Size: 18x25cm (7x9.8") *Size may vary 2-5mm. Material: Aluminum Mylar, Thickness: 4.125 MIL (11C) Can store up to 1300g of powdered products