I don't have a lot of humidity but once the package is opened the sheets curl outwards (the A side pops up). For what I needed this for I had to use spray glue and glue two sheets back to back to get a flat product. Others that use this do not have this problem, but I have brought some of their stock here and it will curl and warp. Small punch outs under 2" (4-5 cm) across stay relatively flat but just sitting there open, the top sheets of the pack lift and curl (lift about 1/4-3/8" across the 11" dimension) Some 4x6" items have warped close to a quarter inch on the grainline (seems to run across the short axis or the 8.5" side of the sheets, the ends at 11" stay down and the center rises; warping to the so called 'top face' of the stack as first opened)
Otherwise this has good stiffness, a somewhat matte finish and mounting stuff to it (photos and other cardstock punchouts) is easy. I did discontinue using this and went to a slightly lighter (100# vs this, 110#) stock from Cardstock Warehouse. That stays flat. I also get from Neenah Warehouse (110#), that stays flat.
I purchased this on a friend's recommendation and used/made items from it at her location and had no problems with it until I brought those items home, and I had already purchased and opened this when I noticed the curl warp. I didn't give it a lower rating because of the experience with this elsewhere. Just do note that it may do this for you.
















