I got these and some others sold through Amazon to compare. I am using these for postcard size cards for games and photo prints. These tended to be thicker at 1.6 mil than other sleeves typically at 1-1.2 mil thickness. You can also feel the difference in thickness compared to other brands. These are also more consistent in size throughout the pack. The adhesive on the flap is secure and sturdy enough to not worry about loosing stickiness when opening and closing. Obviously the more frequently you open and close the worse the adhesive strength will become. The seams are sturdy and you shouldn't expect them to split apart easily as with others during standard use. This was a good purchase for intended purpose and will order more.