Milkweed is the most effective wind and thermal checker in the world. Pair it with the Butterfly Effect Milkweed pouch and you have a deadly combination. Each pouch comes stuffed with 3-4 pods worth of milkweed and a carabiner for easy attachment to packs, binocular harnesses, etc. Pull the milkweed straight through the mesh back, or, open the zipper up and pull straight from the top. The mesh allows for ventilation to keep the milkweed dry.