Reclosable Clear Face Document Envelopes RCF66, formerly LNP66 have a peel and stick adhesive backing. FREE SHIPPING to the Continental 48 States. They can be opened and closed again and again without damaging the bag. Use for shipping papers, job tickets, invoices, maintenance records or container label With pressure sensitive backing sticks to most surfaces - flat or contoured! Reclosable Clear Face Document Envelopes RCF66 are 2 mil thick and help seal out moisture, dirt, dust, grease & oil.