his backpack uses cuben fiber. Dyneema was UV resin laminated and made into very thin film. Cuben fiber is used for yacht's sales since this is light weight with high water resistance. You cam remove the board backside to make it portable, Please note this bag is made for light weighted and might break if you overload.
WHITE CUBAN FIBER
Quality:ポリエチレン(cuben fiber) 別布 POLYESTER 100%
POLYETHYLENE（cuben fiber） partly POLYESTER 100%
made in Japan