10-Pack Fine Mesh Nylon Aquarium Filter Media Bags with Zipper - Reusable Fish Tank Filter Bags for Bio Balls, Ceramic Rings & Carbon - Perfect for Freshwater & Saltwater Tanks

• ??? ? ➟ Close up shot of the bag to show the plastic (??? metal) zipper.• ??? ? ➟ Close up shot of the bag containing Purigen, which was rinsed inside of the bag. You can see the fineness of the mesh here, in addition to how the edges are finished.I purchased the 10ct. Fine Mesh Bag. I was finally so excited to find a mesh bag that would effectively hold Purigen, without the horrible price gauge of “The Bag.” These bags are fantastic, & suit my needs perfectly. They even feature plastic zippers, so there’s no worries about harming your livestock with corrosive metal parts. ?The bags are sewn from a very fine, semi-opaque mesh that easily holds small synthetic polymers/other media. The mesh feels stiffer than expected—more like a silky, more rigid tulle material. This makes folding the bag less “flexible” than other ones created with softer, nylon materials. However, this in no way hampers its usability. Sewn together with a wide seam allowance, some of the bags did have a few stray threads. But that didn’t affect my rating or usage of them at all.Although the bags were a bit bigger than what I needed, I’m currently using them in multiple tank setups of mine for Purigen & holding cycled filter media. The bags fit well inside of an Aqua Clear 75, but any smaller filters may see the unused portion of the bag fitting a bit snugly.