Just Funky enters the water bottle scene. Here's a cool water bottle with a surprise inside that will keep your drinks extra cool! 

They have chosen the annoyed/foot-tapping sprite for Sonic for the bottle's art. He's only on one side, as it's a clear bottle. The rest of it is covered in a pattern of small pixelated gold rings. The cap is blue/ordinary. It probably has a re-use-able straw.
But what's going on at the bottom there?

This clear plastic water bottle with blue cap has 16 bit style pixel 'foot tappin' Sonic with a busy background of pixelated rings. That's pretty standard stuff. But, look inside at the bottom there...and you can see something yellow.

Clearly, there's something inside, and it is re-use-able re-freeze-able ring shaped ice cubes! These chill your drink without diluting it, so long as you remember to dump them out, wash them, and put them back into the freezer after each use. Other bottles have had emeralds shapes that do this same thing--however, they are a great pack in/tie in item and really do add to the fun. Sonic themed ice!

Reusable bottles reduce waste and let you stay hydrated and healthy with whatever you want to drink always on hand. Plastic-enclosed ice also stays cool longer. 

This is a 2018 item. It CAN be found at Game Stop in summer 2018, but may also be available elsewhere as it is not an exclusive. It should be about 14.99 when you find it.