Our 30Microns biodegradable cello bags are manufactured with a PLA film, which renders them completely compostable and biodegradable. PLA is a polymer which is formed from plant starches and sugars, and made into a resin that can be used in a vast variety of products. It's versatile material means that you can pack and store your products inside the bags, while protecting them from dust, dirt and scratches. The Clear nature of the plastic allows for clarity on the product inside, and the 185 x 138 mm is just one of many available in our range. If you require a specific size, please do get in touch with a member of our team who will be happy to help you.