A system for transporting a plurality of wind turbine blades comprising: a plurality of root frame elements (30, 92) that are configured for supporting a root portion of a wind turbine blade, the root frame elements (30, 92) stacked on top of each other to form a plurality of blade stacks that are positioned in a side-by-side fashion with each other so wind turbine blades may be supported in a stacked array (62, 90); at least one bridging element (54, 94) spanning between a root frame element (30, 92) of one blade stack and a root frame element (30) of an adjacent blade stack for laterally securing the blade stacks in the side-by-side fashion; at least one lashing element (100) spanning diagonally across diagonally adjacent root frame elements (30, 92) of adjacent blade stacks and coupled to the said diagonally adjacent root frame elements (30, 92) of the adjacent blade stacks for increasing the stiffness of the blade stacks in the stacked array (62, 90).