I store all of my card stock in hanging file folders, and I do have 35 sheets at least in many of them and most of my card stock is PTI, so heavyweight. I have always just used regular Pendaflex hanging file folders and never had a problem with them falling apart.
I do not store all I have of a color in one folder if it fills it so much that the paper won't sit right in the folder and starts getting messed up on the bottom edge (know what I mean?) and that has nothing to do with weight of the paper, just the width of the hanging file. I'd rather add a second folder for that color, or put the paper in an "overflow" area.
I have looked at "box files" but they are expensive and, unless they actually hit the bottom of the file drawer, I find the bottom of the box just bows downwards and, again, the paper doesn't sit right. Just my experience.
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