LOCKING CAP: The cap opens and closes easily with the touch of a thumb, preventing leaks and messes. NUTRITION READY: Designed to carry gels, water, electrolytes or your own nutrition mixes. LIGHT & FLEXIBLE: Lightweight, durable TPU material is soft and flexible for easy squeezing. SMALL & PACKABLE: Compact and collapsible, it slides easily into short pockets, waist packs, belts, and PFDs. EASY DRINKING: Made for splash-free drinking on the move with a high-flow self-sealing silicone nozzle.