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 (
Amazon.com : Hydration Pack Backpack with 3L Bladder, Tactical Water Bag for Hiking, Biking, Running, Walking and Climbing : Sports & Outdoors
Sold - Camelbak Linchpin (32L ish pack with Mystery Ranch harness) | BushcraftUK Community
CamelBak M.U.L.E. Hydration Pack - 3 Liters | REI Co-op