Packaging
Aside from the mouse, one finds a braided USB Type-A to Type-C charging cable, wireless dongle, set of grip tape, set of replacement feet, set of stickers, and quick start guide in the box.
Weight
My scale shows around 38 g (+/- 1 g), which is exactly in line with the weight cited by Darmoshark. For comparison, the smaller G-Wolves HSK Pro weighs 26 g, which furthermore comes with a 130 mAh battery instead of the 300 mAh one used on the M5, whereas the similarly sized G-Wolves Hati-R 8K weighs 28 g. A good weight.
Cable
The M5 comes with a paracord-like, braided charging cable (USB Type-A to Type-C). In terms of flexibility, this one is below average, especially for a mouse this small and light, and playing while charging without feeling overly restricted is largely prevented. Its measured length is 1.50 m, and a ferrite bead is attached.
Feet
The feet on the M5 are white-dyed pure PTFE (Teflon) feet. They are of average thickness and have slightly rounded edges. Glide is good. The ring around the sensor ensures CPI stay consistent upon applying vertical pressure.