The smart design of the MACS SmartStrainers allows improved ventilation during filtration, and so avoids clogging of the strainers. The MACS SmartStrainers easily fit into standard 15 mL and 50 mL conical tubes of all major suppliers. MACS SmartStrainers are stackable and thus allow filtration with decreasing mesh sizes in one go. Their compact design facilitates sterile handling. One box contains 50 sterile, single-packed and ready-to-use strainers.