I've been looking for a way to keep tax records: all those receipts from month-to-month tax summaries stock and mutual fund annual mailings deductible receipts like health visits prescriptions mileage records and the like as well as business-related costs. For a few years I have been able to use filled-up inter-office mail envelopes but with retirement that source has dried up. These 10" x 13" kraft envelopes in a 12 pack fit that usage perfectly and are the same size as the inter-office envelopes. They are big enough to hold all the summaries and the duplicate tax forms comfortably for a home tax return situation. I'm now good for another 12 years!
I was taking a Digital Photography class at my local university and needed to hand in my printed photos for grading so I purchased this 12/pack. This was a convenient size for both my 5"x7" and 8"x10" prints. I am also using the remaining envelopes to mail more photos which I have printed as gifts. I can also use them for any 8 1/2" x 11" documents that I would prefer not to fold. The store had them In Stock which was also convenient. I bought most of my other class supplies at Staples too.