Fine-Mesh Filter Bag with Zipper Corrosion-proof zipper 32 cm x 14 cm (12.5” x 5.5”) No Strings or Ties The Zip Bag™ is a mesh bag for holding filtration media. It is available in a 32 cm x 14 cm (12.5” x 5.5”) size , easily holds 1 liter of filtration media, and it comes with a convenient corrosion-resistant zipper. It is ideal for intermediate sized (larger than resins and sands) filtration media such as PhosGuard, MatrixCarbon, SeaGel, de?nitrate, Renew and Zeolite.