MSR INLINE MICRO FILTER FOR HYDRATION PACK BLADDER PURIFIER SEALED Connects between bladder and drinking tube. Granular Activated Charcoal Filter removes bad taste and odors of halogens (like iodine and chlorine) used to treat water for viruses Compatible with other brand hydration systems - Camelbak etc. Source/Vagabond Systems Military quick-connect fittings Rugged high military standard ABS Plastic Construction