I make miniature books and ship worldwide. I use these envelopes when international customers buy large quantities of my 1:12 scale books. I have never had a complaint about the condition of my books upon arrival to any of my customers. In fact all of my customers remark on how well the books are packed and that they arrive in pristine condition. These envelopes are great for shipping small flat items or documents that can be folded in half.
We use these envelopes to mail 5" x 8" cards that are thicker than the standard card-stock. If we need a bit of protection small bubble wrap cut into properly sized sheets works just fine.
We use the 6x9 envelopes on a daily basis. We are retired senior citizens and these envelopes are a great help to us in keeping our daily paperwork in organized order. The envelopes are the correct size for filing paid bills each month and daily debit card receipts. They are the proper size to file in a file drawer where we can get to them easily if we have a question about a receipt from a earlier date. Since we use them so much we buy them in the 100 amount and in a few months we are back in Staples to buy another box. Shirley Turner