Bottlecap:

• use it in sommer so no insects get in while you look away,
• use it all year so you know which bottle is yours.
• use it for a decoration at a theme Party. 
• use it so it's harder that someone can put shady stuff in your bottle. 

Simply pop it on your bottle!

For now without a gasket so it is not water tight, but it only drips out a little.

Enjoy.

Look also into my caphat collection for more:

[https://makerworld.com/en/collections/15406734-glas-bottle-caps](https://makerworld.com/en/collections/15406734-glas-bottle-caps)

For the pompom:

I used embroidery thread; you need at least 220 cm.

To start, use three 28 cm lengths of yarn, at the middle of those make a single knot with a 10 cm length of yarn, leaving six ends facing towards you and the piece of yarn that you made the knot with facing up (pic 0).

Then start braiding, using two yarns as one string (pic 1).

After reaching the desired length (I used 5–6 cm), use one of the yarns to tie a knot around the others to secure the end of the braid (pic 2). 

Then, cut 10 x 11 cm pieces of yarn and lay them down so that their centres are over the knot that you have just made.

Now, using a different piece of yarn from the original six, make a knot around all of them. (pic 3).

Fold all the yarns down and gently brush out the ends to separate them into individual strands. (pic4) (GIF 1).

Now, use a 10 cm piece of string, two strands thick, to wrap around four times and tie a knot 5 mm down from the end of the braid. (pic 5).

Now cut the end to your desired length. Mine are 2 cm long from the knot you just made.

now thread the two yarns from the top through the small 3d printed part fix it with some knots around small bit of filament and clip it into the bottle cap.