Kriega 3L Heavy Duty Reservoir - 3LMade of ultra durable, abrasion resistant TPU with RF welded seams for superior strength and elasticity, this 3L Heavy Duty water bladder is fully reversible for easy cleaning and drying. Compatible with all Kriega Backpacks. Flexible Hydrafusion Drink Tube: insulates in hot weather and offers protection in tough conditions Comet Bite Valve: lightweight valve self seals after each sip and can be opened and locked with one hand to prevent leaks when