When I first bought these, everyone that works out and runs or has a peloton or was Helen wanted one due to the lock so I buy some at $20 each. Although the add Showa 2 for $20, it’s inaccurate and you only get ONE. Now my girl colllajns she is going to get smoker lines as a result of having to suck hard to get the liquid thru the straw. I tried it and I will be damned if she was not correct. I thought something was wrong with hers as I had taken the other one to my out of state residence and did not remember having this problem.