2-PACK FOR TRAINING & RACE DAY – Includes two soft flasks, perfect for rotating between runs or packing both for longer distances and hot-weather sessions. Available in 350ml and 500ml sizes. BUILT FOR RUNNING VESTS – Designed to fit securely in all standard running vest, belt, bag, bottle pockets with minimal bounce or shifting. Ideal for endurance, trail, and marathon hydration. ULTRA-LIGHT AND PACKABLE – Folds flat when empty, easy to stash, cuts down on bulk and weight. Stay balanced, focused, and distraction-free on every run. Made from safe, non-toxic TPU that meets FDA and UK FSA standards. BPA & PVC FREE materials. Clean tasting with every sip! LEAK-PROOF, RELIABLE – The soft silicone bite valve delivers a smooth flow with a simple bite or squeeze. Leak-proof and reliable. Easy to fill with water, powders, or ice cubes. Designed for quick rinsing and hand washing, ready for your next run. COMPATIBLE with BUILD & FITNESS – Easy to pop in the 350ml bottle into our LITEBELT Running Belt and the 500ml Set fits perfectly into our Running Vests - peace of mind for the perfect fit.