GoSecure Envelope Extra Strong Polythene 360x460mm Opaque (Pack of 100) PB32324Designed to be durable and tough, the polythene construction prevents ripping and tearing when in transit, keeping contents as safe as possible. The extra strength that these envelopes provide extends to the weather, keeping items from water damage, no matter how bad the weather gets. This 100 pack of envelopes are opaque in colour for confidentiality with a peel and seal closure. Extra strong polythene envelope Water resistant, flexible and 100%