Bacteria filtration for protection from biological contaminants in natural water sources. 100 gallon filter capacity for extended use in the field. Lightweight and compact for easy packing and reduced burden during activity. Fits any Series IV system (such as the Frontier Max). Use with a Geigerrig hydration engine for pressure-assisted filtration on-demand. Miraguard Antimicrobial Technology suppresses the growth of bacteria, algae, fungus, mold and mildew within the filter media. Certified lead free to NSF/ANSI 372. BPA free, chemical free, and iodine free. Boxed with hanging tab.