Trail Water Weight & Filter Planning Engine 🔧 Engineering Calculator · Calculates Metabolic Fluid Depletion, Waypoint Reserves & Pack Weight Distance to Next Water Source: 8 miles (12.8 km) 2 mi8 mi (Average)25 mi (Dry Stretch) Ambient Heat & Exposure: Cool / Shaded (< 65°F / 18°C - 0.5L/hr) Moderate Sun (65°–85°F / 18°–29°C - 0.8L/hr) Extreme Heat / Exposed Ridge (> 85°F / 29°C - 1.2L/hr) Calculated Water Logistics Water Required2.7 LHydration reserve Pack Weight Penalty5.9 lbs2.2 lbs per liter Squeeze Filter Time1.6 minAt 1.7L/min flow Recommended Ultralight Filtration Rig: