Kriega Hydrapak Reservoir Heavy-Duty 2LMade of ultra durable, abrasion resistant TPU with RF welded seams for superior strength and elasticity. Fully reversible for deep cleaning and drying. Compatible with all Kriega Backpacks. Hydrafusion Tube Flexible drink tube insulates in hot weather and offers protection in tough conditions. Comet Bite Valve & Dust Cover Lightweight valve self seals after each sip and can be opened and locked with one hand to prevent leaks when not in use. Included