Here's the deal: All bottles are not the same height, they actually vary quite a lot...

So in order to be sure that the BottleKeeper® will work for as many bottles as possible, we custom designed the BottleKeeper® Cap to have a range -- while sealing the inner beer and keeping the delicious contents inside the bottle.

Although the cap may not screw down all the way with some bottles, it's working exactly as intended!

*Note that the cap isn't intended to keep a vacuum seal like the original bottle cap, but will certainly help to keep your beer fresh and inside your bottle.