This endura luminite backpack cover is fully seam sealed making the cover truly waterproof this endura cover is emblazoned with high visibility reflective safety chevrons to ensure you can be seen from all directions and angles the cover will fit any backpack from 15 30 litres in size and to keep it secured it uses elastic straps and multiple stud positions in order for it to fit all backpacks endura luminite backpack cover features waterproof packable fabric fully seam sealed emblazoned