Not all outdoor activities utilize the same knots, so why would you carry around a knot reference guide full of knots you don’t need, and missing the essential knots you do need? ReferenceReady knot cards are handy knot reference books that are super rugged, extremely portable, and totally waterproof, with knots selected for your favorite outdoor activities. Just grab the set for the day’s activities, be it climbing, backpacking, sailing, fly fishing, or horse riding, and head out the door with the knowledge that you’ve got a relevant knot reference guide at the ready.