1InTheOffice Poly Envelopes Expandable Plastic Clear Envelope with Button & String Closure, Letter Size, Clear, 20 Pack

I purchased these so I could organize birth certificates, passports, banking paperwork, etc., Works perfect! Sturdy, each will hold about 50 sheets of paper, notebook size. They are see-thru and labels stick readily to the surface. I first looked in Walmart for these, but no longer available there, and what was available was triple the cost.