I use these envelopes for mailing our checks out for paying bills for employee payroll etc. They are the perfect size for what we need. I was paying 2-3 times as much for these through another company and had started having to use the ones from [...] (which did not have the security lining) to bring our costs down. I was so happy to find these through Staples online!
The only disadvantage of this product is that you need to seal the envelopes. The price is excellent for the product but my boss prefers to not have to dampen a seal. These will be back-up supplies.
I purchased a box of these envelopes numerous times thinking the glue on the first box was messed up. The second box was the same. I'm ordering from a different supplier now.
This envelope works perfect for our accounts payable. We send out a large number of checks each month and the convience of not having to address envelopes is well worth paying for the envelopes.