What size folders fit in it?

At roughly 12.25 inches wide and 10 inches tall, it takes standard letter and A4 folders and hanging-file style jackets stood upright. Oversized legal folders and bulky lever-arch binders will not fit well.

No. It is an open-top file holder, so documents stay visible and easy to grab but are exposed to dust and daylight.

Can I stack several of them?

Not safely. The acrylic walls are not designed to carry weight on top, so place them side by side on a shelf instead.

Is it good for long-term archiving?

It works for active, dry storage, but it is not a sealed archive box. For long-term storage in a garage or attic, a lidded, acid-free carton protects paper better.

How many folders does it hold?

It holds a modest stack, roughly a shelf's worth of folders rather than a full drawer. It is best for the files you use regularly.

Is acrylic durable enough for daily use?

It is rigid and holds its shape, but it scratches easily and can crack if dropped or overloaded. Handle it as you would any clear plastic desk accessory.