Les Sources Widepac Ultimate 23-2L-Alpine Blue is the classic water bag and the preferred choice for hikers, runners, cyclists and mountain bikers around the world. Hydration bladder requires little maintenance and has no taste. The Ultimate can be filled via the screw cap at the front or via the wide opening on the top. Here are the specifications of the Widepac Ultimate 23-2L: Wide and unique opening for easy filling and drying of the bag, resistant to high pressure, screw cap on the front for filling on the front. Wideslide patented wide opening (100% waterproof) Low maintenance Glasslike technology (smooth surface that looks like glass and is difficult to fix for bacteria) Easy to maintain GrungeGuard technology (built-in antibacterial supplement reducing the development of bacteria. es) Water continues to taste like water Stays fresh for days or even weeks without plastic taste SQC (Source Quick Connect) closure to the water bladder Bite valve Helicoidal insulated tube cover (UV protection and temperature control Slim profile (hose hidden in water bladder) 2 liters (grey cap) 190g size: 20.3 x 37 cm TasteFree technology Three-layer polyethylene sheet that retains the taste of water without aftertaste) This van Source drinking system fits most regular backpacks with a supply for a hydration pack.