Reinforced Firm Cardboard Collar: Each bag has a sturdy cardboard collar with a protective barrier, forming a secure connection with the device ' s metal collection tube to particle leakage during use Designed for Traditional Standing Models: These bags are made to fit traditional standing devices, including select limited models 99.97% Efficient Particle Retention: Made from thick, breathable fabric, these bags use multiple filtering layers to retain 99.97% Of fine particles and irritants, helping maintain a new environment while minimizing floating contaminants 15 Pack Value Set: This replacement bag set includes 15 well crafted bags, providing extended use without frequent repurchasing Roomy 22x12 Inch Design: Measuring 22x12 inches (56x30.5 Cm), these bags feature reinforced heat sealed edges to hold large amounts of debris