My place of business uses these 9" x 12" envelopes for various purposes: to mail documents and/or photos which should not be folded (once glued these envelopes stay shut) to hand-deliver documents that need a safe cover that can be easily accessed (the clasps on these envelopes are sturdy) to store photos and documents in hanging files to hold promotional materials that will be handed out at events. These envelopes are a good priceand well made and help us stay organized and send information.