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 (
Camelbak MULE, MultiCam (OCP), 100 oz/3.0L, with Mil-Spec Antidote (Long) Reservoir - The ArmyProperty Store
Camelbak Linchpin | A Small Pack with Large Pack Features | SOFREP
Sold - Camelbak Linchpin (32L ish pack with Mystery Ranch harness) | BushcraftUK Community