I think this product is just super. I use this envelope quite frequently to mail out my bills in purchases of my magazines sending out my many donations to such organizations like St. Jude Children's Research Hospital Dana Farber Cancer Institute Memorial Sloan Kettering Cancer Center and Breast Cancer Research Society. This type of envelope is very sturdy in construction and with the sticky strip to close and secure the envelope this is a great feature as well. I would only use this type of envelope--it's just perfect for me!