1. Compatibility: Our high-quality vacuum cleaner bags are designed for a wide range of Karcher models, including WD 2 Plus, WD 3, WD 3 S, KWD 1, KWD 2, KWD 3, MV 3, as well as WD 3.200 to WD 3.800 M, SE 4001 and SE 4002 series. 2. Highly Efficient Filtration: Our nonwoven fabric filter bags are replacements for Karcher WD3 bags and offer excellent filtering performance by capturing 99.97% of microscopic dust particles, helping maintain a hygienic environment and reduce allergens. 3. Large Capacity: With our vacuum cleaner bags (suitable for Karcher WD2), enjoy extended use between changes and maintain a clean, organized living space for weeks. 4. Quality Material: Our nonwoven filter bags are made of durable three-layer nonwoven fabric, ensuring long-lasting, tear-resistant performance. The design helps minimize air leakage and provides efficient filtration for fine dust, hair, coarse debris, and wet dirt.