I love my Sigg water bottle but I was getting frustrated with the screw top lid. I was getting resistance opening and closing from the threads deteriorating. This lid was the answer to my prayers. Super easy to operate, you just press on the white part with your finger or your lips while you drink. A simple turn locks it if you like. There are three things that prevent me from giving a 5 star review.
1. The hinge on the lid does not feel very durable. I wish it was a little wider/sturdier. I feel like a drop could break it.
2. Purely cosmetic, but I wish the white part were gray or black. I'm worried the white is going to turn a kind of off white from contact with lips and fingers.
3. I could connect a carabiner to my screw top lid. This lid doesn't have any way to clip to a bag.
I'm still happy with my purchase, and I would definitely recommend to any Sigg owners that are tired of their screw top.
UPDATE May 10, 2019: If you plan on laying your water bottle on it's side (say, on the passenger seat of your car, or in a bag) with this top on it make sure you lock the top! If the top is not locked and the bottle is on its side it will leak.
SIGG Complete Active Bottle Top fits like all other SIGG closure on all SIGG bottles and is therefore a useful addition to any SIGG, especially if the bottles are used in sports activities. Made of plastic. Screw cap with dirt cap keeps absolutely tight. The protective cap is equipped with a hinge and can easily be opened with your thumb. A light pressure with the mouth activates the drinking opening and ensures maximum flow. Available in transparent black colour.