I originally ordered these envelopes because the kraft brown ones don't show ink as well as the lighter ones but was concerned about the paper thickness. My business requires me to ship books and it's important that the envelopes don't burst during shipment. Compared to some other similar large envelopes that I had from a previous purchase at another store these are far superior. The paper is thicker the color is lighter and the metal clasp is much sturdier. Overall I am pleased with the purchase and will reorder when needed.