I bought this not just to take to the gym, but also because it fits into the standard water bottle sleeves on my hiking pack. Actually, I bought two so that pack would be balanced. Tough as nails and, because this model is unlined, unpainted stainless steel, you can use it to boil water. That’s actually super handy as it’s easy to place within a fire, just cover the lid in tin foil and use your multitool pliers to lift it in and out. Just stick it straight into the middle of a fire, supported by wood on all sides and it’ll have your water boiling quicker than any other method. As an added benefit, I’m the only guy at Body Elite with burned sap all over my water bottle. Take that Mr. Fake Tan.