2L VERTICAL RESERVOIR 2.0Dakine Replacement Reservoir 2L The Dakine 2L Hydrapak design of the Replacement Reservoir is engineered to be durable and easy use. The Shape Loc center baffle adds some rigidity to the shape of the bladder, which cuts down on shifting of water weight while you're in motion, and makes for a more resilient design. While the wide mouth opening and plug and play connecters make it easy to fill, drain, and clean. And, of course, it's BPA and PVC free.