We purchased these envelopes because they appeared to be a good value. Unfortunately the envelope's seams were not well sealed especially at the corners. We called Staples and they sent out a replacement box. Those envelopes were in the same condition...I guess they are saving cost by scrimping on glue? Pay a little more for the envelopes that you don't have to tape all the edges closed.
I use these envelopes: To keep warranty information and instructions. To keep personal folders re regular utility and retail associations. To maintain personal records.