Dropps Fabric Softener Pacs are also eco-friendly, from formula to packaging. The formula, created from a clay material, is naturally formed from a chemical alteration of volcanic ash that is enclosed in an energy-efficient, dissolvable pac. The packaging, biodegradable and safe in all septic tanks, is part of a revolutionary recycling solution resulting from a partnership between Dropps and TerraCycle, the international upcycling enthusiast.