The CamelBak Podium Dirt Series Chill 21oz Bike Bottle is an insulated water bottle for ice cold sips on the mountain bike trails. When the weather is hot, and you're in the saddle, there is nothing like cold hydration along the way. This bottle features double-wall construction to keep liquids cold, plus an integrated mud cap to prevent dirt and grime from getting onto the nozzle. Flip the lid up and give the bottle a gentle squeeze, and the high-flow jet valve opens with ease. The valve is self-sealing, so water stays inside until you're ready for the next sip.