Don‘t forget to drink enough water during a race. If an average adult should drink 2,5/3,5 lt of water per day, an athlet during a heavy exercise in hot conditions can lose more than 1 lt. of sweat per hour so to avoid dehydratation, drink 400-800 ml. of fluid per hour. Zipp water bottle grey 500ml(16 oz.) LPDE plastic, 100% BPA and PHTHALATE free. 74 gr(2.6 oz.) Easy to squeeze, big mouth, easy to fill and easy to clean.