Get a grip! These are the same bottles that Craig Alexander used en route to his 2nd Hawaii Ironman win! designed with ergonomic grooves for easy handling, the plastic is soft enough to squeeze and hold when youre flying down the road. A clear window on the side of the bottle lets you see how many ounces youve got left and the wide-mouth top makes filling very easy. It is complete with a pressure release valve to prevent spillage.