Works fine, but I wouldn't buy again...

Small Aquarium Mesh Media Filter Bags - High Flow 500 micron - 3" by 8" with Drawstrings. They work just fine, but now that I have discovered I can get the same usage from cut-up pantyhose from the dollar store, I'm pretty sad I spent what I spent on these. That said, I bought them for bio media, not carbon, so it's not like I will be emptying them and refilling them with any sort of regularity; were I using them for carbon, I might see the point in them, since wet knotted pantyhose packets would certainly be less convenient to open and reuse. Maybe.

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