This mug was made to celebrate the short animation "Chao in Space", that Sega did. As you'll know "Chao in Space" is the 'movie' that you always saw as a movie poster decoration around various levels/various games when they wanted a billboard or other 'advertising space' as part of the level.
Well, Sega decided it was going to actually 'make' it, and you can find/watch it on their Youtube. However, it turns out that it is all a dream by a neutral chao. This mug, in the Sega Shop at the end of 2019, is about 15 dollars and was produced to help hype the short.

It features a colorful and fun variety of art for various chao types. There are hero, dark, and accessorized ones, as well as the very under-represented 'feature' ones where they've had several of the same type of animal so it changes their appearance slightly. The mug sides look different, but it is changing the size/place of the chaos to create the look of a wrap-around graphic. This is a cute item for chao fans!