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.
I use these envelopes for storing my tax records. Most of the hard copy statements including medical Explanation of Benefits (EOB's) are 8 1/2" x 11" and not too many forms can be stuffed into standard sized envelopes. These 10" x 13" envelopes are the perfect size for retaining all the tax records for three or more years. A good sturdy product!
This size envelope is good for large documents or many papers however it is not a sturdy envelope...very thin. I was hoping for a sturdier envelope but could not feel the quality until the package was opened.