Quality Park 63577 Colored Paper String & Button Interoffice Envelope, 10 x 13, Blue,100/Box : Amazon.co.uk: Stationery & Office Supplies
Quality Park 10 x 13 Inter-Departmental Envelopes with String & Button Closure for Interoffice Routing, 28 lb Recycled Brown Kraft, 100 per Carton (QUA63560) : Amazon.co.uk: Stationery & Office Supplies