Packaging
Aside from the mouse, one finds a braided charging cable (USB Type-A to Type-C), wireless dongle, quick start guide, set of grip tape, and a key fob inside the box.
Weight
My scale shows around 51 g (+/- 1 g), which is exactly in line with the weight cited by Pwnage. For comparison, the significantly larger DeathAdder V3 Pro weighs in at 62 g, but doesn't have any holes, and the slightly larger Pulsar Xlite Wireless V2 weighs 59 g, while having fewer holes but no proper bottom plate. An excellent weight overall.
Cable
The StormBreaker comes with a paracord-like, braided charging cable (USB Type-A to Type-C). In terms of flexibility, this one is strictly average, and loses to recent Razer charging cables, and even more so to ASUS ROG charging cables, for instance. Accordingly, charging while playing may feel restrictive on the StormBreaker. The measured length of the cable is 1.75 m.
The charging cable also functions as an extension cable when used in conjunction with the wireless extender. Due to size of the dongle, a dongle storage compartment is neither present nor possible.
Feet
The feet on the StormBreaker are white-dyed pure PTFE (Teflon) feet. They are of average thickness and have slightly rounded edges. Glide is very good.