Reusable silicone bag with stand-up design. 1.5L. *The Porter Bag Stand Up is the latest in storing snacks, ingredients and leftovers. *These silicone bags are not only secure, easy to open and can stand up on their own, they're also a stylish and eco-friendly alternative to the disposable plastic bag. *Unlike ordinary disposable plastic zip lock bags, the Porter Bag is made from microwave and oven-safe silicone which means you can cook or reheat food directly inside the bag.