Fits most cup holders and bike cages. Easy to use, one-hand open Flip N' Sip BpA-free cap. Keep it on your desk or take it along with you in the car, to a yoga class, to school, shopping or for a stroll along the beach… wherever you go, it goes! Caring for your Flip N' Sip cap The patented Flip’ N Sip cap has the remarkable ability to provide a good flow of water free of air bubbles and noise. This is possible because of the small clear Silicone air bladder located just beneath the flip up drinking spout. Because the air bladder is tiny and made of clear silicone, consumers sometimes lose it which necessitates the purchase of another entire cap. Please keep an eye on this. If it falls out due to direct pressure it can be reseated. While the bottle and cap are dishwasher safe, please wash the cap on the top shelf only or by hand, with the drinking spout closed.