I use 10" X 13" brown envelopes for sorting and for mailing my not-yet-sent tax returns. I knew that 10" by smaller numbers weren't big enough so I saw 10" x 15" as the only similar size on special sale and bought those. Ooops. Not Staples fault my own. They hold my stuff fine--recipes from magazines--but don't fit well in banker's boxes. I rated these 4 stars since the product wasn't at fault just me.
Somehow I thought I was replacing my stock of 10x14 envelopes not realizong that these are 10x15. I still prefer 10x14 but those were not on the shelf at Staples that I could see. Oh well. I’ll make due with these seeing as I opened the box already.