NATHAN ExoShot Handheld Flask 12 oz/355 BPA-Free soft Flask with locking cap and bit valve keeps liquids from escaping Integrated spine creates superior hand feel and support for the soft Flask Ergo-designed hand strap provides grip-free comfort, and maximizes running efficiency Hand strap is removable, allowing soft Flask to be used in most Nathan hydration vest pockets Removable neoprene sleeve offers insulation and tactile, sweat-free grip surface