These Cumberland Packaging Envelopes have an adhesive design and can be attached to your packages before being transported. They have a durable polyethylene construction and a peel and seal closure design to keep your papers safe. Each envelope is printed with 'Invoice Enclosed' so your recipients will know where to find their receipts, payment forms and documents. These envelopes are the standard size for packing slips. You can secure the contents of each envelope thanks to the peel and seal design. The durable polyethylene construction will help to keep your documents protected. Each envelope has a white background and is printed in red and black with 'Invoice Enclosed'. There are 1000 envelopes included in this pack so you can stock up at once.