Massive 100 oz Capacity: Stay hydrated longer with this high-volume reservoir, ideal for tactical missions, hiking, and outdoor endurance activities Wide Fill Port for Easy Access: Oversized 80mm+ opening allows for quick filling, cleaning, and ice addition, making maintenance fast and hassle-free Leak-Proof Quick Link System: Features a secure tube disconnect/reconnect with auto-shutoff for easy refilling and zero leaks during use Durable Baffled Design: Engineered for maximum stability and minimal stack height, perfect for tight spaces and rugged environments Military-Grade Compatibility: Fits pre-2013 ThermoBak 3L, M.U.L.E., H.A.W.G., Motherlode, and BFM packs; built for demanding tactical and outdoor use