Post Office PostPak Size 5 Bubble Envelopes are tough, durable and protective. The bubble bags have a high quality white paper exterior containing a lightweight bubble lining, ensuring contents are transported without the risk of damage.PostPak bubble envelopes will make sure your post stays safely enclosed and protected. Size 5 is perfect for sending documents or anything that can flex without breaking - such as large books, catalogues, documents, leaflets and items of clothing.The PostPak bubble envelopes are a great choice for cost saving, minimizing postage rates. These bubble envelopes come with an easy to write on surface, so no need for postage labels.Pack of 3: Size 5, 260mm x 345mm. Recyclable and water repellent.