Sized right for short trips up the ridgeline and down the trail, Camelbak's 50-oz. OMEGA Water Reservoir is a great choice for compact day hike and approach backpack hydration sleeves. This is a sound substitute for a water bottle because it gives you more liquid capacity in a slim profile that won't stick out like some unyielding cylinders. Camelbak recently refined their entire OMEGA Reservoirs with a HydroTanium polyurethane film that further enhances the integrity of one of the most burst-resistant hydration reservoirs in the industry. We've found that hikers, bikers, skiers and snowboarders who have ever burst a cheap reservoir often opt for the durable design of the Camelbak OMEGA pouch on their next adventure--and it works. Up top you'll find a wide, easy-filling twist cap opening that easily accommodates ice cubes and cleaning brushes. Camelbak used a special HydroGuard antimicrobial silver ion compound to minimize bacterial and fungal growth along the tube and inside the reservoir--minimizing any potential for funky petri dish flavors. All Camelbak ounce OMEGA water reservoirs feature a self-sealing silicon Big Bite Valve that gives you water when you need it without any extra drips on your pack or fleece jacket.