Lately on Fridays I've been been carrying home pizzas on my rear rack. As many do, I use hook bungees to fasten the box to the top of the rack. Of course, this is a good way to lose your wheel if you aren't careful. The hooks get loose, then fall into the spokes.
I normally use ball bungees to fasten my lock to the rack, but typically the thing bounces up and down.
So recently I started trying some small diameter ropes and a few simple knots (in the photos a bowline and a clove hitch). IMHO this system works pretty well.. the lock does a lot less bouncing around.
What are your secrets for lashing things on the bike?