Handheld Hydration 0.5 Liter by Peak Packs with Platypus bottle. The most versatile, light, and convenient sports bottle and pack for life's adventures. Our ultra-light unique Versa-Strap System TM can be used almost anyway imaginable, including the most comfortable run handheld, sling shoulder strap, waist pack, bike handlebars, clips to a backpack or messenger strap, and anywhere else you need your essentials. The compact hydration pack has an easy access padded phone pocket, a sensitive-touch window and headphone port for your music selections, zippered money/cards, key fob, reflective piping and trim, and more. Peak Packs includes a 0.5 L Platypus SoftBottle hydration reservoir with a Platypus HyperFlow locking no leak bite valve. Take on your hike, run, bike and any other outdoor or urban adventure. Stay hydrated and have easy access to your vitals. You deserve better than lugging a water bottle and all your loose ends ... and you don't need 8 pounds of water on your back. At only 5.5" by 10.75", this pack does not weigh you down. The 0.5 L size is perfect for 1 hour activities, and especially great for RUNNERS (most comfortable handheld hydration system ever). Go anywhere, do anything, stay hydrated.