These sheet protectors aren’t the least expensive can buy but for the money these offer the best protection for your important documents. I used to buy these for use at work in communications department of a large railroad to securely store important documents at our field sites and they always worked perfectly. I briefly tried some less expensive ones when the company went on an economy kick but the cheaper protectors did such a poor job I had to got out and replace them with these protectors at several of our field locations.