Packaging
This mouse comes in a very small and simple cardboard box. The contents are the MM057 mouse, its receiver dongle, and a quick-start guide. Minimalism is definitely VicTsing's strong suit here, and I very much fancy this since less trash is generated. There is no battery included in the package by the way, so be prepared for this when you buy this product.
Shape
While the pictures might deceive your eyes, the MM057 is indeed a very small mouse. It has a lot of (right-handed) ergonomic design going on, but unless you have tiny hands, I'm sure it won't be usable with a proper palm grip. For claw and fingertip gripping, I found it quite comfortable.
There are some deep grooves on both sides of the shell, including a ring finger rest, which is uncommon even with expensive mice, not to mention the sub-$10 range. The main buttons are grooved a bit as well for your fingers to settle into a more comfortable position. The back of the mouse narrows down significantly, while the front end flares out, especially at its top parts.
The MM057 is 106 mm (4.07") long, which is pretty much average. The total width is 70.5 mm (2.77"), but depending on your grip style, the actual width at which it is gripped is 58 mm (2.28"), which is much narrower than the nominal measurement. It is is 38.6 mm (1.52") tall, and the hump is more towards the back. With these dimensions, this mouse will mainly be comfortable for right-handed users with relatively small hands, through I may be wrong here as a lot of things can work for casual use.
Here are some extra pictures of the mouse: