The half-gallon Stanley GO Flip Straw Jug holds enough to keep you hydrated throughout your longest and hottest days, with no refills required. It’s designed to be your own personal hydration gear. The built-in straw flips up for easy sipping, then snaps shut to close. Your water stays clean and fresh. It’s also fully leakproof and Stanley’s double-wall vacuum insulation keeps everything ice cold for hours. There’s even a rugged handle for carrying and a built-in hook for hanging on field fences.