Refill your old Wind indicator bottles for a fraction of the price of replacing them. Whether for hunting or other needs, Downwind Advantage offers an effective solution to your empty wind detector bottles. Successful hunters check wind direction frequently, whether for big game or predator control, knowing wind direction is a critical aspect for most types of hunting. Powder filled Windicator bottles are an effective tool for staying downwind; however, if you're like most hunters, they only last a few days before they're empty. Downwind Advantage is the solution to less time driving to the sporting-goods store, and more time in the field with our Wind Detector Refill Powder. Not only does our product save you time, our 8fl. Oz. (236cc) bottle of premium Wind Detector Refill Powder refills for your existing bottles many times for a fraction of the cost of replacing them. Proudly made in the USA, and supplied by American companies.