Hydrapak Breakaway Surge Bottle (Pack of 2)Features Surge valve technology maximizes flow rate and self seals to eliminate leaks and splatter during activity Flexible, ultra light materials and the unique grip groove combine for a sure hold and high flow squeeze. Minimalist single wall design sheds grams and delivers maximum flexibility. Made with bicyclists in mind, the Breakaway bottle fits a variety of bike frame sizes and bottle cages Innovative Surge Cap is two pieces cap and valve and