Pack of 10 Extra Large Polythene Mailing Bags 42x50cm Secure Peel & Seal Envelopes. These extra large 42x50cm mailing bags are designed for sending bigger items such as jackets, blankets, bulk clothing orders, cushions and soft household goods. The durable polythene material offers strong protection while remaining flexible enough to accommodate a wide range of products. With a secure peel and seal strip, each bag provides a tamper resistant closure that keeps your contents safe from opening during transit. The waterproof and tear resistant design ensures your parcels stay protected from rain and handling, making these bags ideal for businesses that ship larger or irregular shaped items.