Not the parent, but I cut myself a nice stick, divided it into shortish lengths of three, probably about 20cm, sanded them down. Three sticks lets you practice a number of knots, and I stored them tied with two lengths of rope (the fantastic hitch, forget what it's called, but two of them are brilliant for bundling poles together).

Then I just carried that around in my bag, or in a drawer at work, and when the opportunity presented itself, I practiced.