Bubble Lined Size K/7 Padded Brown Postal Envelope by Janrax. Inner size. 350x470mm. Padded envelopes are a versatile and reliable shipping solution for sending items through the mail. These envelopes are designed with a layer of protective padding that helps to safeguard your items against bumps, scratches, and other types of damage during transit. Made from strong 110gsm manilla kraft paper with durable 45gsm bubble. These are peal and seal and provide a strong closure to keep documents and products safe and secure. Padded envelopes are easy to use and require no additional packaging materials. Simply insert your item into the envelope and seal it. Available in a range of sizes from the Janrax range.