COMPLETE SET FOR RUNNERS: Includes two collapsible flask water bottles specifically designed to fit Trekkers vests, two straw lids & two baking soda cleaning sachets; everything you need to stay hydrated while exercising, running or hiking COMFORTABLE FIT FOR LONG RUNS: This running vest water bottle set stays secure & bounce-free inside hydration vest pockets or belts; a perfect lightweight companion for trail running, marathons, or mountain hikes FLEXIBLE & PACKS FLAT: Each space saving soft water bottle running flask compresses as you drink & folds flat when empty; it fits easily in running vests or belts, with a squishy body that prevents water slosh LEAKPROOF & DURABLE: These clear running water bottles use premium quality, no-leak materials that hold up to pressure & movement, ideal for trail athletes who need gear that performs under tough conditions ODOUR FREE HYDRATION: Two included baking soda sachets remove any bad taste or smell, ensuring your water stays clean, pure & fresh-tasting with every use so you can hydrate & stay refreshed