The packaging for the X370 Killer SLI is rather toned down despite the huge stylised 'K'. There is information about the motherboard itself including the platform details and support.
The reverse reveals an image of the product, some key details and specifications.
Inside the accessories are a little bit light, but it includes some SATA cables, a high bandwidth SLI bridge, the driver disc, back plate, Setup guide and manual. As well as 3x small screws for each M.2 slot.
Neutral colours are a big theme lately, ASRock jump readily into this with white on black. The X370 Killer SLI features a white shroud over the rear IO and audio sections and has an unmissable 'K' on the main body. There are two PCIe x16 slots each given a steel cover (secondary is electrically x8), and there is a double space between them ensuring compatibility for triple slot coolers. There are an additional 4x PCIe x1 slots. There doesn't appear to be any debug LEDs or onboard controls.