These are exactly what the seller indicates. They are thin and a bit flexible, and lightweight. Don't expect strength.
However, this is PERFECT for separating stacking paper stuff.
I bought these for clutter control on my desk. And I just ordered another set.
I use this for pre-filing all the standard stuff I get monthly or periodically, bills, bank statements, recipe printouts. They are all now in one ORGANIZED and NEAT pile until I have a chance to file them for real. It's so great to just lay down bills in a stack and then, with a small amount of effort, put it in with like papers. I label the dividers for easy filing and retrieval.
These are serious clutter busters for me.

It works fine for sorting papers as well as stackin T-Shirts. You can pull a shirt out from the bottom of the stack without disturbing the rest of the shirts. I use it in an armour so it can be set on the shelf and it works fine there. I could not see using it in a drawer. In a drawer it is easier to fold and stand up t-shirts, etc. It is light weigh and a flimsy product but it works for what I am using it for.

This product works really well. It's straight forward and simple. I saw this product in a list of "Things to help you get organized." It's simple in design and implementation, and those are its greatest strengths, as there's no rods or shelving or anything. It collapses as you remove your shirts from it, as intended.

My only real complaint with this is that it effectively feels like a stack of liners for paint roller trays. The simplicity of the design is good, but the drawback is that there's nothing really holding this thing together, aside from gravity. When it's full, it looks a little lopsided as my shirts have different thickness when folded.

Overall, it works as designed, and would be a useful accessory for a cubby hole or some other small storage area, as well as the closet/dresser space it's designed to occupy.

I really like this product -- so much so that that I just purchased 4 more 20-paks! I was expecting a lot -- and was even more pleased when I actually used the EZSTAX.

Other reviewers have complained about the "flimsy" material. In my opinion, the thin, flexible construction is a feature, allowing me to stack 20 shirts in the same space that would only accommodate 12 loosely folded shirts.

So, why only 4 stars? I want to get the manufactures attention for a needed improvement: add a folding board to the pack. Give me one less EZSTAX layer and instead include a simple, rectangular piece of the same material to use as the folding guide. Attempting to fold by hand and following the instructions provided leads to bulky, non-uniform folds that greatly defeat the purpose. After attempting fold on my own I was unhappy with the outcome. So, I undid everything and used a common nylon kitchen cutting board as a folding guide. This simple solution reduced the stack size by a third and made the result look more like what is advertised.

Very happy with this purchase!

As many have written, the sheets are somewhat flimsy but the system wouldn't work if the dividers were thicker. I ordered the 20 pack and used two stacks of 10.
Many complained the shirts slid when fanned to get shirt in middle. I found with a little pressure or holding the top half prevents this. Also alternating the thicker neck end of the shirt helps even the stack.