These are great guides to the most common fishing knots and they're easy to pack because of their compact size. Also they're printed on plastic, so they are waterproof and very durable. I'm a salt water fisherman, so the fact that they are corrosion resistant is important to me.
Disclaimer: Any activity involving rope can be dangerous and may even be life threatening! Knot illustrations contained in this web site are not intended for rock climbing instruction. Many knots are not suitable for the risks involved in climbing. Seek professional instruction. Many of these knots have histories of use tracing back hundreds of years. However, many critical factors in their use today cannot be controlled, including: the appropriateness of knots used in particular applications, the age, size, and condition of ropes (knots weaken the rated breaking strength of rope anywhere from 50% to as much as 80%, even more in the case of old and worn rope); and the accuracy with which these descriptions have been followed. No responsibility is accepted for incidents arising from the use of this material.