Opinel Cardboard Sleeve Fits Op00065 Op00081 Op01070 Op01071 Op01072 Op11020 Op11030 Op11040 Op11050 Op13060 Op21040 Op23060. This Opinel Cardboard Sleeve is brown Kraft-colored and features two cutout holes in the top to put your knife in the optimum position for best presentation. With the top flaps down slide your knife in as far as possible and then let it breathe and dry completely before storing or travelling. For best results turn the blade side face down and let it air dry completely. The best protection Opinel Pocket Knives offers is the protection it provides from the elements so your blade will last longer than you give it a try. Package Contents: Opinel Cardboard Sleeve Opinel 815022: Cardboard Sleeve Fits: Op00065 Op00081 Op01070 Op01071 Op01072 Op11020 Op11030 Op11040 Op11050 Op13060 Op21040 Op23060