Packaging
Aside from the mouse, one finds a USB Type-C to Type-A charging cable, full-speed wireless dongle, wireless extender, quick start guide, set of stickers, and a pre-cut set of grip tape for the main buttons and sides in the sturdy box.
Weight
My scale shows around 62 g (+/- 1 g), which is exactly in line with the weight cited by Razer. Compared to the DeathAdder V2 Pro, the V3 Pro loses a whopping 25 g without resorting to externally visible holes, and only losing RGB lighting in the process. The only mice that can compete in this regard are the Cooler Master MM731, which likewise lacks external holes but is smaller, and the Pulsar Xlite Wireless V2, which is similarly sized but has holes. An excellent weight.
Cable
The DeathAdder V3 Pro comes with a flexible, braided USB Type-A to Type-C charging cable. 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 firm the connection is. In terms of flexibility, this one isn't quite on the level of the recent ASUS ROG or Glorious charging cables, but is significantly improved over previous, stiffer Razer charging cables. Accordingly, the DeathAdder V3 Pro can be used as if it were a wired mouse with barely, if any, perceivable difference in terms of handling compared to an exclusively wired mouse. Since the cable supports the HyperPolling Wireless Dongle, shielding equivalent to that of a high-speed wired mouse is present. The cable is 1.80 m long.
The charging cable also functions as an extension cable when used with the wireless extender. The wireless extender can be used to keep the distance between dongle and mouse as short as possible. Since the mouse itself lacks a storage compartment for the dongle, the extender can also simply be used as something to attach the dongle to, reducing the likelihood of the dongle being lost when traveling.
Feet
The feet on the DeathAdder V3 Pro are non-dyed pure PTFE (Teflon) feet with slightly rounded edges. Glide is excellent and thickness average. The ring around the sensor ensures CPI stay consistent upon applying vertical pressure.