EASY!!,, fly business class, they allow heaps extra weight in luggage, Virgin are good for up to 69 kilograms.
I still reckon that jas a sezual conotation, ie the 69, typical randy Richy Branson!!
Only little issue, the business class ticket is just a teeny bit more expensive than a pleb class ticket!
Oh well, at least ypu could drill holes in it for lightness, why not stock up oneruvian Marching powder at same time!