Our upgraded model of stand up pouches, the Color Metallised Mylar Zip Stand Up Bag is a double sided metallised foil bag that is coated with a layer of matte for extra durability. The round-bottom gusset opens up when the bag is filled, allowing it to stand on its own. Enhanced with a grip seal, these bags are guaranteed to keep your contents fresh. If you need extra security, they can also be heat sealed above the zipper and re-opened from the tear notches found on the side. NOT RECOMMENDED FOR LIQUIDS (WATER, JUICE), PLEASE TAKE A LOOK AT OUR HEAVY DUTY FOIL BAGS FOR LIQUID STORAGE.