100 Count Diamond Clear Extra Heavyweight Sheet Protectors, 4 mils Strong, by Gold Seal, 8.5 x 11", Top Load, 100 Pack

I use these as dividers for my card stock, placing my extra pieces of each color inside the protectors and adding a label to the top with the color name. They are very strong - enough to stand up straight between sheets without paper inside and hold several pieces of thick paper. I just cut the holes off on the side before the seam so they are the same size as paper. (Not my idea - found it from social media, but can't find her name to give credit). They're also completely transparent, but not reflective. I had to buy a 2nd pack to use for genealogy and other craft supplies since they're archival %26 acid free!