TheTeaLAB Brew Bag is made out of 400 micron nylon mesh and climbing grade binding. Hand stitched in Seattle by a cut and sew shop that specializes in hard-core backpacking gear, needless to say, this bag is made to last. Fill the Brew Bag about 1/3 way full of compost materials, roll the top down and clip the buckle. Suspend the bag in the brew with the caribiner clip. Simple, effective.