Packaging
Aside from the mouse, one finds a charging cable (USB Type-A to Type-C), wireless extender, wireless dongle, sticker, quick start guide, and set of replacement feet inside the box.
Weight
My scale shows around 55 g (+/- 1 g), which is exactly in line with the weight cited by Xtrfy. Despite being similarly sized, the M8 Wireless manages to weigh 12 g less than the M42 Wireless, which has holes and extensive RGB lighting, both of which are absent on the M8 Wireless. An excellent weight.
Cable
The M8 Wireless comes with a paracord-like, braided charging cable (USB Type-A to Type-C). There is no anchor at the mouse-end of the cable, so the cable may come loose during use, though it is unlikely given how tight it sits. In terms of flexibility, it is roughly on par with the cable of the wired MZ1, which sits in the same league as the Glorious Model O/D/O-/D- charging cable. Accordingly, the M8 Wireless can be used as if it were a wired mouse with barely any perceivable difference in terms of handling compared to an actual wired mouse. Unlike on the majority of other wireless mice, the USB port isn't found centered at the front, but rather off-center on the right side. The measured length of the cable is 1.80 m.
The charging cable also functions as an extension cable if used in conjunction with the wireless extender. The wireless extender can then be used to keep the distance between dongle and mouse as short as possible. Since the mouse lacks a storage compartment for the dongle, the extender can also simply be used as something to attach the dongle to, which reduces the likelihood of the dongle being lost when traveling.
Feet
The feet on the M8 Wireless are white-dyed pure PTFE (Teflon) feet. They are of average thickness and have slightly rounded edges. Glide is excellent. Small indents next to the feet make them easier to remove. While there is no sensor ring installed by default, one is included with the set of replacement feet in the box.