This 1 .2L hydration reservoir is suitable for Revolutiv 12(V2), 24, all Responsiv and all Activ packs and vests. The bite valve has a locking system to ensure no annoying leaks Flexible reservoir with slide top opening for easy filling The hose can be disconnected from the reservoir without leaking as there is a shut off valve The bite valve has a push/pull lock to stop any pressure leaks The hose is insulated to help protect from cold and heat Features:Weight: 150gCapacity: 1.2LFlat dimensions: 27 x 20cm Composition:Thermoplastic Polyurethane (TPU) Bag, Polyurethane Hose,Silicone Valve, Polyethylene (PE) Valve Insert Other features: Quick release hose for easy cleaning Insulated tube cover included Silicone bite valve with locking system Slider closure for low-profile secure closure Dual-hang design allows the reservoir to hang vertically or horizontally in a pack BPA Free