The Small 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 has the smallest mesh size in the Zip Bag line and is capable of holding all Seachem filtration media including resins Sizes 32 cm x 14 cm (12 5” x 5 5”)