... This product is listed as a "Mud Cap," and I thought it contained the entire top for the Sigg water bottle. It doesn't. Think of the mud cap as a dirt/germ cover to keep the spout you drink from (the Active bottle top) clean.
The Mud top CLIPS on to the HINGE of one type of the bottle tops. The other type of cap has an O-ring part that SLIPS over the top of the bottle, then the spout you drink from screws in over it, and then the cap covers the spout. This is NOT a mud cap, but called something else and seems to get in the way when you're trying to drink from the bottle.
I prefer the mud cap because it flips completely out of the way as you drink, whereas this other O-ring cap flops in your face as you drink. The only consideration: for toddlers: when they drop the Sigg bottle, the Mud cap hinge can break, whereas the floppy O-ring doesn't. For teens and adults; go with the Mud cap. ...
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