I have been using magnesium chloride soaks for years to relax and soothe body aches. I started to accumulate those 3 lb plastic containers from a different brand, and wanted to get an economic refill. This costs just slightly more per oz, but I don't have the guilt of acuumulating and wasting giant plastic jugs that I just cant find a repurpose for. This is the same zechtenstein salt (so far as the reviews claim), and I don't notice anything different in smell or performance. For the price, a lot of brands will charge more for a smaller bag.