Hi Magnus,
Apologies for tardy reply as I just returned from an out of town trip.
My Dyna-Sonic weighs in at 3903g. The box (with all the packing material and swag) weighs 1333g and measures approximately 43.5 x 43.5 x 27 cm.
As to packing quality, the box is heavy-grade cardboard and the drum seems well protected. I bought a Yamaha snare many years (decades?) ago (still have the box) and the Rogers drum was similarly packed. I believe Rogers are distributed in Canada out of Vancouver, so mine went from place of manufacture in the US to place of distribution in Canada to retailer in Ottawa Ontario and back to me on the west coast. It easily travelled 10,000 km before it got into my hands and arrived in perfect condition. Based on that, I'd say odds are very good that it would survive an overseas journey.
Best of luck!