By-products occurring in cotton preparation are often incorrectly classified as waste. In the past, fall-out fibres were separately vigogne spun and condenser spun to coarse low efficiency yarns. The profit obtainable per kg of yarn, however, is only marginal. The cost-intensive handling of by-products like sorting, pressing, opening, cleaning, and transporting reduce the profit of processing fall-out fibre in vigogne spinning to an extent to make this process uneconomical.