Camelbak M.U.L.E 100oz Hydration Carrier - Smiths Surplus and Supply
Camelbak Ambush AB 500, Thermobak AB, and Linchpin Tactical Hydration Packs/Reservoirs with Direct Armor Attachment System (D.A.A.S.): Strap your tactical hydration directly to your tactical armor plate carrier/tactical vest system! – DefenseReview.com (